Cover Document Information [Table] Document Information [Line Items] Document and Entity Information Document Type Document Annual Report Document Period End Date Document Transition Report Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company ICFR Auditor Attestation Flag Document Financial Statement Error Correction [Flag] Entity Shell Company Entity Public Float Entity Common Stock, Shares Outstanding Documents Incorporated by Reference [Text Block] Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Auditor Name Auditor Location Auditor Firm ID CONSOLIDATED BALANCE SHEETS Statement [Table] Statement [Line Items] Statement Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Accounts Receivable, Net, Current Accounts receivable Accounts receivable, net of allowance of $31,302 and $31,124 Inventory, Net Inventories, net Prepaid Expense, Current Prepaid expenses Marketable Securities, Current Marketable securities Other Assets, Current Other current assets Assets, Current Total current assets Tangible assets that are used in operations and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Excludes capitalized software development costs. Property Plant and Equipment Excluding Software Development Costs, Net Property and equipment, net Represents the costs incurred associated with the development, modification or acquisition of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization, net of accumulated amortization. Excludes costs related to curriculum content. Capitalized Software Development Costs for Software Applications Used Internally, Net Capitalized software, net Represents the costs incurred associated with the development, modification or acquisition of software programs or applications for internal use related to curriculum content (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization, net of accumulated amortization. Capitalized Software Development Costs for Software Application Used Internally, Curriculum Content, Net Capitalized curriculum development costs, net Capitalized curriculum development costs, net Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Goodwill Balance at the end of the period Balance at the beginning of the period Goodwill Deferred Income Tax Assets, Net Deferred tax asset Other Assets, Noncurrent Deposits and other assets Assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities, Current [Abstract] Current liabilities Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued liabilities Employee-related Liabilities, Current Accrued compensation and benefits Contract with Customer, Liability, Current Deferred revenue Finance Lease, Liability, Current Less: current portion of finance lease liability Current portion of finance lease liability Operating Lease, Liability, Current Less: current portion of operating lease liability Current portion of operating lease liability Liabilities, Current Total current liabilities Finance Lease, Liability, Noncurrent Long-term finance lease liability Long-term finance lease liability Operating Lease, Liability, Noncurrent Long-term operating lease liability Long-term Debt Long-term debt Total debt Deferred Tax Liabilities, Net, Noncurrent Deferred tax liability Deferred tax liability Other Liabilities, Noncurrent Other long-term liabilities Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Equity: Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity Preferred Stock, Value, Issued Preferred stock, par value $0.0001; 10,000,000 shares authorized; zero shares issued or outstanding Common Stock, Value, Issued Common stock, par value $0.0001; 100,000,000 shares authorized; 49,126,917 and 48,852,419 shares issued; and 41,477,230 and 43,517,676 shares outstanding, respectively Additional Paid in Capital, Common Stock Additional paid-in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Retained Earnings (Accumulated Deficit) Retained earnings Treasury Stock, Value Treasury stock of 7,649,687 and 5,334,743 shares at cost, respectively Stockholders' Equity Attributable to Parent Balance Balance Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Allowance for Doubtful Accounts Receivable Accounts receivable, allowance (in dollars) Allowance for doubtful accounts Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Shares Issued Preferred stock, shares issued Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars 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 Treasury Stock, Shares Treasury Stock, Balance (in shares) Treasury Stock, Balance (in shares) Treasury stock, shares CONSOLIDATED STATEMENTS OF OPERATIONS Revenue from Contract with Customer, Including Assessed Tax Revenues Total Revenues Cost of Reimbursable Expense Instructional costs and services Gross Profit Gross margin Selling, General and Administrative Expense Selling, general, and administrative expenses Asset Impairment Charges Impairment of long-lived assets Operating Income (Loss) Income from operations Interest Income (Expense), Nonoperating, Net Interest expense, net Other Nonoperating Income (Expense) Other income, net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income before income taxes and income (loss) from equity method investments Income Tax Expense (Benefit) Income tax expense Total income tax expense Income (Loss) from Equity Method Investments. Income (loss) from equity method investments Net income attributable to common stockholders Net income Earnings Per Share [Abstract] Net income attributable to common stockholders per share: Weighted average shares used in computing per share amounts: Earnings Per Share, Basic Basic (in dollars per share) Basic net income per share (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Diluted net income per share (in dollars per share) Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average shares used in computing per share amounts: Weighted Average Number of Shares Outstanding, Basic Basic (in shares) Weighted average common shares-basic Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Weighted average common shares-diluted CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income attributable to common stockholders CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Equity Components [Axis] Equity Component [Domain] Common Stock Common Stock Additional Paid-in Capital Additional Paid-in Capital Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) Retained Earnings Retained Earnings Treasury Stock Treasury Stock Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Shares, Issued Balance (in shares) Balance (in shares) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustment Treasury Stock, Value, Acquired, Cost Method Purchase of treasury stock, net of tax Treasury Stock, Shares, Acquired Purchase of treasury stock, net of tax (in shares) Common stock redeemed (in shares) Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation expense It represents the amount of vesting of performance share units, net of tax withholding. Stock Issued During Period Value Performance Share Units Net Of Tax Withholding Vesting of performance share units, net of tax withholding Vesting of performance share units, net of tax withholding. Stock Issued During Period Shares Performance Share Units Net Of Tax Withholding Vesting of performance share units, net of tax withholding (in shares) Stock Issued During Period, Value, Restricted Stock Award, Gross Issuance of restricted stock awards Stock Issued During Period, Shares, Restricted Stock Award, Gross Issuance of restricted stock awards (in shares) Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Forfeiture of restricted stock awards Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Forfeiture of restricted stock awards (in shares) The cash outflow for repurchase of restricted stock during the reporting period for income tax withholding. Repurchase of Restricted Stock for Income Tax Withholding Repurchase of restricted stock for tax withholding Number of shares of restricted stock repurchased to settle grantee's tax withholding obligation for award under share-based payment arrangement. Repurchase Of Restricted Stock For Income Tax Withholding Shares Repurchase of restricted stock for tax withholding (in shares) CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]. Cash flows from operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Depreciation, Depletion and Amortization Depreciation and amortization expense Share-based Compensation Stock-based compensation expense Deferred Income Tax Expense (Benefit) Deferred income taxes Total deferred Provision for Doubtful Accounts Provision for credit losses Amortization of Debt Issuance Costs Amortization of fees on debt Operating Lease, Right-of-Use Asset, Amortization Expense Noncash operating lease expense Other Operating Activities, Cash Flow Statement Other Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, prepaid expenses and other assets, associated with underlying transactions that are classified as operating activities. Increase Decrease In Inventories Prepaid Expenses And Other Assets Inventories, prepaid expenses, deposits and other current and long-term assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued liabilities Increase (Decrease) in Employee Related Liabilities Accrued compensation and benefits The increase (decrease) during the reporting period in the operating lease liabilities. Increase (Decrease) In Operating Lease Liabilities Operating lease liability Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable, and other liabilities. Increase Decrease In Contract With Customer Liability And Other Liabilities Deferred revenue and other liabilities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]. Cash flows from investing activities Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Payments for Software Capitalized software development costs Capitalized software development costs The cash outflow associated with development of curriculum. Payments to Capitalized Curriculum Development Costs Capitalized curriculum development costs Capitalized curriculum development costs Payments to Acquire Other Investments Other acquisitions, loans and investments, net of distributions Proceeds from Sale and Maturity of Marketable Securities Proceeds from the maturity of marketable securities Payments to Acquire Held-to-maturity Securities Purchases of marketable securities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Cash flows from financing activities Finance Lease Principal Payments Repayments on finance lease obligations Payments for Repurchase of Common Stock Purchase of treasury stock Amount paid to repurchase common stock Payment for repurchase of restricted stock for income tax withholding, financing activities. Payment For Repurchase Of Restricted Stock For Income Tax Withholding Financing Activities Repurchase of restricted stock for income tax withholding Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash used in financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net change in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash, end of period Cash, cash equivalents and restricted cash, beginning of period Description of the Business Nature of Operations [Text Block] Description of the Business Basis of Presentation Basis of Accounting [Text Block] Basis of Presentation Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Property and Equipment and Capitalized Software and Curriculum Property, Plant and Equipment Disclosure [Text Block] Property and Equipment and Capitalized Software and Curriculum Income Taxes Income Tax Disclosure [Text Block] Income Taxes Finance and Operating Leases The entire disclosure of information about leases. Lease Disclosure [Text Block] Finance and Operating Leases Debt Long-term Debt [Text Block] Debt Equity Incentive Plan Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Equity Incentive Plan No definition available. Employee Stock Purchase Plan The entire disclosure for employee stock purchase plan. Employee Stock Purchase Plan [Text Block] Employee Stock Purchase Plan Stock Repurchase Program Treasury Stock [Text Block] Stock Repurchase Program