Notes To Financial Statements [Abstract] Notes to Financial Statements [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Statement [Line Items] Statement [Line Items] Net Profit Per Share Earnings Per Share [Text Block] Disclosure Common Stock Repurchase Program Additional Information [Abstract] Disclosure - Common Stock Repurchase Program - Additional Information [Abstract] Share Repurchases [Table] Share Repurchases [Table] Share Repurchases [Table] Share Repurchases, by Program [Axis] Share Repurchases By Program [Axis] Share Repurchases, by Program [Axis] Share Repurchases, by Program [Domain] Share Repurchases By Program [Domain] Share Repurchases, by Program [Domain] Common Stock Repurchase Program Common Stock Repurchase Program [Member] Common Stock Repurchase Program [Member] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Additional Paid-in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Share Repurchases [Line Items] Share Repurchases [Line Items] Share Repurchases [Line Items] Repurchase of common stock, common stock authorized Stock Repurchase Program, Authorized Amount Repurchase of common stock, shares repurchased Stock Repurchased During Period, Shares Repurchase of common stock, average price per share Share Repurchases Price Paid Per Share Share Repurchases, Price Paid Per Share Repurchase of common stock, aggregate purchase price Stock Repurchased During Period, Value Stock Repurchase Program, Remaining Authorized Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Disclosure Change In Carrying Value Of Goodwill [Abstract] Disclosure - Change in Carrying Value of Goodwill [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Business Segments [Axis] Business Segments [Axis] Segment [Domain] Segment [Domain] Scanners and CAD/CAM Services Scanners And CADCAM [Member] Scanners and CAD and CAM [Member] Clear Aligner [Member] Clear Aligner [Member] Clear Aligner [Member] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Balance as of December 31, 2011 Goodwill Impairment of goodwill Goodwill, Impairment Loss Balance as of September 30, 2012 Disclosure Short Term And Long Term Marketable Securities [Abstract] Disclosure - Short-Term and Long-Term Marketable Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule of Fair Value of Separate Accounts by Major Category of Investment [Axis] Schedule of Fair Value of Separate Accounts by Major Category of Investment [Axis] Schedule of Fair Value of Separate Accounts by Major Category of Investment, Category [Domain] Schedule of Fair Value of Separate Accounts by Major Category of Investment, Category [Domain] Long-term Investments Long Term Investments [Member] Long Term Investments [Member] Short-term Investments Short-term Investments [Member] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Corporate bonds Corporate Bonds [Member] Corporate Bonds [Member] Commercial paper Commercial Paper [Member] Agency Bonds [Member] Agency Bonds [Member] Agency Bonds [Member] Foreign bonds Foreign Government Debt Securities [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Amortized Cost Available-for-sale Securities, Amortized Cost Basis Gross Unrealized Gains Available-for-sale Securities, Gross Unrealized Gains Gross Unrealized Losses Available-for-sale Securities, Gross Unrealized Losses Fair Value Available-for-sale Securities, Fair Value Disclosure Disclosure Activity Under Stock Option Plans [Abstract] Disclosure - Activity Under Stock Option Plans [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Shares Underlying Stock Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding as of December 31, 2012 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Cancelled or expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Outstanding as of March 31, 2013 Vested and expected to vest at March 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Exercisable at March 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Outstanding as of March 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Vested and expected to vest at March 31, 2013 (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Exercisable at March 31, 2013 (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted Average Remaining Contractual Term Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] Outstanding as of March 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Vested and expected to vest at March 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Exercisable at March 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Outstanding as of March 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Vested and expected to vest at March 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Exercisable at March 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Disclosure Segments And Geographical Information Additional Information [Abstract] Disclosure - Segments and Geographical Information - Additional Information [Abstract] Segment Reporting Disclosure [Table] Segment Reporting Disclosure [Table] Segment Reporting Disclosure [Table] Segment Reporting Disclosure [Line Items] Segment Reporting Disclosure [Line Items] Segment Reporting Disclosure [Line Items] Number of reportable segments Number of Reportable Segments Disclosure Balance Sheet Components Additional Information [Abstract] Disclosure - Balance Sheet Components - Additional Information [Abstract] Schedule of Product Information [Table] Schedule of Product Information [Table] Product Information [Line Items] Product Information [Line Items] Scanners, Warranty period Standard Product Warranty Time Period Standard Product Warranty Time Period Basis of presentation Basis of Accounting, Policy [Policy Text Block] Use of estimates Use of Estimates, Policy [Policy Text Block] Recent Accounting Pronouncements Recent Accounting Pronouncements [Policy Text Block] Recent accounting pronouncements , Policy [Text Block] Investments, Debt and Equity Securities [Abstract] Major Types of Debt and Equity Securities [Axis] Range [Axis] Range [Axis] Range [Domain] Range [Domain] One year or less Available-for-sale Securities, Current One year through two years Available-for-sale Securities, Noncurrent Total available for sale securities Available-for-sale Securities Schedule Of Earnings Per Share Basic And Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Warranty Accrual Schedule of Product Warranty Liability [Table Text Block] Disclosure Credit Facilities Additional Information [Abstract] Disclosure - Credit Facilities - Additional Information [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Letter of Credit [Member] Letter of Credit [Member] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Wells Fargo [Member] Wells Fargo [Member] Wells Fargo [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of credit, available borrowings Line of Credit Facility, Maximum Borrowing Capacity Unrestricted Cash Deposit Unrestricted Cash Deposit Unrestricted cash deposit. Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Line of Credit Facility, Amount Outstanding Line of Credit Facility, Amount Outstanding Goodwill and Acquired Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Disclosure Minimum Future Lease Payments For Non Cancelable Leases [Abstract] Disclosure - Minimum Future Lease Payments for Non-Cancelable Leases [Abstract] Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] 2013 (remaining nine months) Operating Leases Future Minimum Payments Due Remainder Of Period Operating Leases, Future Minimum Payments Due, Remainder of Period 2014 Operating Leases, Future Minimum Payments, Due in Two Years 2015 Operating Leases, Future Minimum Payments, Due in Three Years 2016 Operating Leases, Future Minimum Payments, Due in Four Years 2017 Operating Leases, Future Minimum Payments, Due in Five Years Total minimum lease payments Operating Leases, Future Minimum Payments Due Disclosure Computation Of Basic And Diluted Net Profit Per Share Attributable To Common Stock [Abstract] Disclosure - Computation of Basic and Diluted Net Profit Per Share Attributable to Common Stock [Abstract] Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Table] Schedule Of Earnings Per Share Basic And Diluted By Common Class [Table] Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Table] Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] Schedule Of Earnings Per Share Basic And Diluted By Common Class [Line Items] Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Net profit (loss) Net Income (Loss) Attributable to Parent Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted-average common shares outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Dilutive effect of potential common stock (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Total shares, diluted Weighted Average Number of Shares Outstanding, Diluted Net profit (loss) per share, basic Earnings Per Share, Basic Net profit (loss) per share, diluted Earnings Per Share, Diluted Disclosure Accrued Liabilities [Abstract] Disclosure - Accrued Liabilities [Abstract] Schedule of Accrued Liabilities [Table] Schedule Of Accrued Liabilities [Table] Schedule of Accrued Liabilities [Table] Schedule of Accrued Liabilities [Line Items] Schedule Of Accrued Liabilities [Line Items] Schedule of Accrued Liabilities [Line Items] Accrued payroll and benefits Employee-related Liabilities, Current Accrued sales rebate Accrued Marketing Costs, Current Accrued sales tax and value added tax Sales and Excise Tax Payable, Current Unclaimed merger consideration Merger Consideration Payable Merger Consideration Payable Accrued warranty Standard Product Warranty Accrual, Current Accrued sales and marketing expenses Accrued Sales And Marketing Current Accrued Sales and Marketing, Current Accrued accounts payable Accrued Accounts Payable Accrued Accounts Payable Accrued distributor expenses Accrued Distributor Expenses, Current Accrued Distributor Expenses, Current Accrued professional fees Accrued Professional Fees, Current Accrued income taxes Accrued Income Taxes, Current Other Other Accrued Liabilities, Current Total Accrued Liabilities, Current Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Net profit (loss) Adjustments to reconcile net profit to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Deferred taxes Deferred Income Tax Expense (Benefit) Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Amortization of Intangibles Amortization of Intangible Assets Stock-based compensation Share-based Compensation Excess tax benefit from share-based payment arrangements Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating Activities Impairment of goodwill Asset Impairment Charges Asset Impairment Charges Recovery of doubful accounts and returns Provision And (Recovery) For Doubtful Accounts Provision and (Recovery) For Doubtful Accounts Other Noncash Income (Expense) Other Noncash Income (Expense) Changes in assets and liabilities, net of acquired assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued and other long-term liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Deferred revenues Increase (Decrease) in Deferred Revenue Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Restricted cash Increase (Decrease) in Restricted Cash Purchase of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Purchase of marketable securities Payments to Acquire Available-for-sale Securities Maturities of marketable securities Proceeds from Sale and Maturity of Available-for-sale Securities Other assets Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Common stock repurchase Payments for Repurchase of Common Stock Excess tax benefit from share-based payment arrangements Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities Employees' taxes paid upon the vesting of restricted stock units Payments Related to Tax Withholding for Share-based Compensation Other Proceeds from (Payments for) Other Financing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Effect of foreign exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of the period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of the period Disclosure Stock Based Compensation Expense Related To All Stock Based Awards And Employee Stock Purchases [Abstract] Disclosure - Stock-Based Compensation Expense Related to All Stock-Based Awards and Employee Stock Purchases [Abstract] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Cost of net revenues Cost of Sales [Member] Sales and marketing Selling and Marketing Expense [Member] General and administrative General and Administrative Expense [Member] Research and development Research and Development Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Stock-based compensation expense Allocated Share-based Compensation Expense Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] ICA Holdings Pty Limited [Member] ICA Holdings Pty Limited [Member] ICA Holdings Pty Limited [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Total consideration transferred Business Combination, Consideration Transferred Payments to acquire business Payments to Acquire Businesses, Gross Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Summary of Goodwill by Reportable Segment Goodwill By Segments Table [Text Block] Goodwill by Segments [Table Text Block] Schedule Of Amortized Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Goodwill and Intangible Asset Impairment [Abstract] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Property, Plant, Equipment [Member] Property, Plant, Equipment [Member] Property, Plant, Equipment [Member] Goodwill Disclosure Summary Of Financial Assets Measured At Fair Value On Recurring Basis [Abstract] Disclosure - Summary of Financial Assets Measured at Fair Value on Recurring Basis [Abstract] Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring Basis [Table] Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Cash Equivalents Cash Equivalents [Member] Restricted Cash and Cash Equivalents, Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents, Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Money market funds Money Market Funds [Member] Corporate bonds Corporate Bond Securities [Member] Agency bonds Agency Securities [Member] Israeli Severance Funds Israeli Severance Funds [Member] Israeli Severance Funds [Member] Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Investments Other assets Other Assets, Fair Value Disclosure Assets, Fair Value Disclosure Assets, Fair Value Disclosure Disclosure Summary Of M S U Performance [Abstract] Disclosure - Summary of MSU Performance [Abstract] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Market Performance Based Restricted Stock Units Market Performance Based Restricted Stock Units [Member] Market Performance Based Restricted Stock Units [Member] Number of Shares Underlying MSUs Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested as of December 31, 2012 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested and released Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested as of March 31, 2013 Weighted Average Remaining Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Nonvested as of March 31, 2013 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Term 1 Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term 1 Aggregate Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Aggregate Intrinsic Value [Abstract] Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract] Nonvested as of March 31, 2013 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Intrinsic Value Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Outstanding, Intrinsic Value Disclosure Total Estimated Annual Future Amortization Expense For Acquired Intangible Assets [Abstract] Disclosure - Total Estimated Annual Future Amortization Expense for Acquired Intangible Assets [Abstract] Expected Amortization Expense [Table] Expected Amortization Expense [Table] Expected Amortization Expense [Table] Expected Amortization Expense [Line Items] Expected Amortization Expense [Line Items] Expected Amortization Expense [Line Items] 2012 (remaining nine months) Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2014 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Future Amortization Expense Thereafter Future Amortization Expense, Thereafter Net Carrying Value as of March 31, 2013 Finite-Lived Intangible Assets, Net Maturity Period Used To Classify Investments Maturity Period Used To Classify Investments Maturity Period Used to Classify Investments Marketable Securities, Weighted Average Remaining Maturity Marketable Securities, Weighted Average Remaining Maturity Marketable Securities, Weighted Average Remaining Maturity Statement of Financial Position [Abstract] Accounts receivable, allowance for doubtful accounts and returns Allowance For Doubtful Accounts Receivable And Sales Returns Current Allowance For Doubtful Accounts Receivable And Sales Returns Current Preferred stock, par value (in usd per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Document Documentand Entity Information [Abstract] Document and Entity Information [Abstract] Entities [Table] Entities [Table] Document Information [Line Items] Document Information [Line Items] Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Marketable Securities and Fair Value Measurements Financial Instruments Disclosure [Text Block] Income Statement [Abstract] Net revenues Revenue, Net Cost of net revenues Cost of Revenue Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Research and development Research and Development Expense Total operating expenses Operating Expenses Profit from operations Operating Income (Loss) Interest and other income (expense), net Nonoperating Income (Expense) Net profit before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net profit (loss) Net profit (loss) per share: Earnings Per Share [Abstract] Basic (in usd per share) Diluted (in usd per share) Shares used in computing net profit (loss) per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Diluted (in shares) Effective Income Tax Rate, Continuing Operations Effective Income Tax Rate, Continuing Operations Accounting for Income Taxes Income Tax Disclosure [Text Block] Summary of Significant Accounting Policies [Abstract] Summary of Significant Accounting Policies [Abstract] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Adjustments for Error Corrections [Axis] Adjustments for Error Corrections [Axis] Adjustments for Error Correction [Domain] Adjustments for Error Correction [Domain] Scenario, Previously Reported [Member] Scenario, Previously Reported [Member] Scenario, Adjustment [Member] Scenario, Adjustment [Member] Error Corrections and Prior Period Adjustments Restatement [Line Items] Error Corrections and Prior Period Adjustments Restatement [Line Items] Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) Segments and Geographical Information Segment Reporting Disclosure [Text Block] Disclosure Warranty Accrual Activity [Abstract] Disclosure - Warranty Accrual Activity [Abstract] Accounts Payable and Accrued Liabilities [Table] Accounts Payable And Accrued Liabilities [Table] Accounts Payable and Accrued Liabilities [Table] Accounts Payable and Accrued Liabilities [Line Items] Accounts Payable And Accrued Liabilities [Line Items] Accounts Payable and Accrued Liabilities [Line Items] Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Balance at beginning of period Standard Product Warranty Accrual Charged to cost of revenues Standard Product Warranty Accrual, Warranties Issued Actual warranty expenditures Standard Product Warranty Accrual, Payments Balance at end of period Disclosure Long Lived Assets By Geographic Area [Abstract] Disclosure - Long-Lived Assets by Geographic Area [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Statement, Geographical [Axis] Geographical [Axis] Segment, Geographical [Domain] Segment, Geographical [Domain] United States UNITED STATES MEXICO MEXICO the Netherlands NETHERLANDS Other international Other International [Member] Other International [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Long-lived assets Long-Lived Assets ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Restricted cash Restricted Cash and Cash Equivalents, Current Marketable securities, short-term Available-for-sale Securities, Debt Securities, Current Accounts receivable, net of allowance for doubtful accounts and returns of $1,247 and $2,484, respectively Accounts Receivable, Net, Current Inventories Inventory, Net Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Marketable securities, long-term Available-for-sale Securities, Debt Securities, Noncurrent Property, plant and equipment, net Property, Plant and Equipment, Net Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Deferred tax assets Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Other assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Deferred revenues Deferred Revenue, Current Total current liabilities Liabilities, Current Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 7) Commitments and Contingencies Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.0001 par value (5,000 shares authorized; none issued) Preferred Stock, Value, Issued Common stock, $0.0001 par value (200,000 shares authorized; 81,725 and 80,611 issued and outstanding in 2013 and 2012, respectively) Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive income (loss), net Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Disclosure Accounting For Income Taxes Additional Information [Abstract] Disclosure - Accounting for Income Taxes - Additional Information [Abstract] Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Income Taxes [Line Items] Income Taxes [Line Items] Income Taxes [Line Items] Increase in gross unrecognized tax benefits Unrecognized Tax Benefits, Period Increase (Decrease) Unrecognized tax benefits Unrecognized Tax Benefits Credit Facilities Debt Disclosure [Text Block] Disclosure Inventories [Abstract] Disclosure - Inventories [Abstract] Schedule of Inventory [Table] Schedule Of Inventory [Table] Schedule of Inventory [Table] Schedule of Inventory [Line Items] Schedule Of Inventory [Line Items] Schedule of Inventory [Line Items] Raw materials Inventory, Raw Materials, Gross Work in process Inventory, Work in Process, Gross Finished goods Inventory, Finished Goods, Gross Inventories Disclosure Summary Of Goodwill By Reportable Segment [Abstract] Disclosure - Summary of Goodwill by Reportable Segment [Abstract] Legal Proceedings [Abstract] Legal Proceedings [Abstract] Legal Proceedings [Text Block] Legal Proceedings [Text Block] Legal Proceedings [Text Block] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan [Member] Stock-based Compensation Expense Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Stock Option Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary Of Nonvested Shares Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Summary Of Nonvested Shares Schedule of Nonvested Performance-based Units Activity [Table Text Block] Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Disclosure Net Revenues By Geographic Area [Abstract] Disclosure - Net Revenues by Geographic Area [Abstract] Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Accounting Changes and Error Corrections [Abstract] Schedule of Error Corrections and Prior Period Adjustments Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Common Stock Repurchase Program Share Repurchase Program Disclosure [Text Block] Share Repurchase Program Disclosure Subsequent Event Subsequent Events [Text Block] Statement of Other Comprehensive Income [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Change in unrealized gains (losses) on available-for-sale securities, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Net change in accumulated other comprehensive income (losses) Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule of Future Lease Payments Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Disclosure Intangible Assets As Direct Result From Cadent Acquisition [Abstract] Disclosure - Intangible Assets as Direct Result from Cadent Acquisition [Abstract] Schedule of Finite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived Intangible Assets [Table] Acquired Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Trademarks Trademarks [Member] Existing technology Existing Technology [Member] Existing Technology [Member] Customer relationships Customer Relationships [Member] Other Other Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Gross Carrying Amount as of March 31, 2013 Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite Lived Intangible Assets Accumulated Amortization Period Increase Decrease Finite-Lived Intangible Assets, Accumulated Amortization, Period Increase (Decrease) Accumulated Impairment Loss Finite-Lived Intangible Assets, Accumulated Impairment Loss Finite-Lived Intangible Assets, Accumulated Impairment Loss Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Disclosure Weighted Average Assumptions Used For Fair Value Of Stock Options Granted Estimated At Grant Date Using Black Scholes Option Pricing Model [Abstract] Disclosure - Weighted Average Assumptions Used for Fair Value of Stock Options Granted Estimated at Grant Date Using Black-Scholes Option Pricing Model [Abstract] Stock Options Stock Options [Member] Expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividends Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted average fair value at grant date (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Disclosure Stockbased Compensation Additional Information [Abstract] Disclosure - Stock-based Compensation - Additional Information [Abstract] Employee Stock Purchase Plan 2010 Employee Stock Purchase Plan 2010 [Member] Employee Stock Purchase Plan, 2010 [Member] Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Axis] Schedule Of Share Based Compensation Arrangement By Share Based Payment Award [Axis] Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Axis] Share-based Compensation Arrangements by Share-based Payment Award [Domain] Share Based Compensation Arrangements By Share Based Payment Award [Domain] Share-based Compensation Arrangements by Share-based Payment Award [Domain] Incentive Plan 2005 Stock Incentive Plan 2005 [Member] 2005 Stock Incentive Plan [Member] Amended And Restated 2005 Stock Incentive Plan Amended And Restated 2005 Stock Incentive Plan [Member] Amended And Restated 2005 Stock Incentive Plan [Member] Minimum Minimum [Member] Maximum Maximum [Member] Approved increase in shares Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Shares reserved for issuance Common Stock, Capital Shares Reserved for Future Issuance Total unamortized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Weighted average period of total unamortized cost (in years) Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Vesting period of granted market-performance based restricted stock units Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Percentage of market-performance based restricted stock units eligible to vest over the vesting period Percentage Of Market Performance Based Restricted Stock Units During Vesting Period Maximum percentage of market-performance based restricted stock units during vesting period. Maximum number of shares available Employee Stock Purchase Plan Number Of Shares Available For Issuance Employee Stock Purchase Plan, Number Of Shares Available for Issuance Number of shares remaining Share Based Compensation Arrangement By Share Based Payment Award Shares Remaining Available For Issuance Share Based Compensation Arrangement By Share Based Payment Award Shares Remaining Available For Issuance Disclosure Segment Information [Abstract] Disclosure - Segment Information [Abstract] Invisalign Full [Member] Invisalign Full [Member] Invisalign Full [Member] Invisalign ExpressLite [Member] Invisalign ExpressLite [Member] Invisalign Express/Lite [Member] Invisalign Teen [Member] Invisalign Teen [Member] Invisalign Teen [Member] Invisalign Assist [Member] Invisalign Assist [Member] Invisalign Assist [Member] Invisalign Non-Case Revenues [Member] Invisalign Non-Case Revenues [Member] Invisalign Non-Case Revenues [Member] Scanners [Member] Scanners [Member] Scanners [Member] CADCAM Services [Member] CADCAM Services [Member] CADAndCAM Services [Member] Revenue Gross profit Note 8. Stock-based Compensation [Abstract] Note 8. Stock-based Compensation [Abstract] Disclosure Net Profit Per Share Additional Information [Abstract] Disclosure - Net Profit per Share - Additional Information [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings per share, amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Short-Term And Long-Term Marketable Securities Available-for-sale Securities [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Financial Assets Measured At Fair Value On Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Disclosure Summary Of Nonvested Shares [Abstract] Disclosure - Summary of Nonvested Shares [Abstract] Number of Shares Underlying RSUs Weighted Remaining Vesting Period