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Schedule of restructuring liability Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Common stock dividends (in dollars per share) Common stock dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Schedule of Maturities of Marketable Securities Investments Classified by Contractual Maturity Date [Table Text Block] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Restricted Cash and Cash Equivalent Item [Line Items] Restricted Cash and Cash Equivalent Item [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Schedule of assets and liabilities measured at fair value on a recurring basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Other Assets Other Assets Disclosure [Text Block] Asset retirement obligations Asset Retirement Obligations, Noncurrent Allowance for credit losses Debt Securities, Available-for-Sale, Allowance for Credit Loss Regulation Regulation Disclosure [Text Block] Regulation Disclosure. Equity Components [Axis] Equity Components [Axis] Tuition receivable, net Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred income tax liabilities Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Reclassifications from AOCI Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Entity Small Business Entity Small Business Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Capella  University Capella University [Member] Held-to-maturity securities Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value, Rolling Maturity [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other assets Other assets Other Assets, Noncurrent Document Type Document Type Cash paid for acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Intangible Asset, Indefinite-Lived Intangible Asset, Indefinite-Lived [Table Text Block] Significant Accounting Policies Significant Accounting Policies [Text Block] Severance and Other Employee Separation Costs Severance And Other Employee Separation Costs [Member] Severance and other employee separation costs. Write-offs, net of recoveries Accounts Receivable Allowance For Credit Loss, Writeoff, After Recovery Accounts Receivable Allowance For Credit Loss, Writeoff, After Recovery Non cash items included in segment income (loss) from operations by reportable segment Segment Reporting Information, Non Cash Items Included in Segment Income (Loss) Reportable Segment [Abstract] not applicable Goodwill [Table] Goodwill [Table] Other Other Assets, Miscellaneous, Current Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Instructional and support costs Operating Costs and Expenses Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Unvested restricted stock and restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends Local Phone Number Local Phone Number Contract liabilities, net of current portion Contract with Customer, Liability, Noncurrent Consolidation Items [Axis] Consolidation Items [Axis] Deferred contract costs Capitalized Contract Cost, Net, Current Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Restrictions on Cash and Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies Commitments and Contingencies Schedule of Other Long-Term Liabilities Other Noncurrent Liabilities [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Pro-rata share in the net income (loss) of limited partnerships Income (Loss) from Equity Method Investments Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Limited Partnerships Limited Partnerships [Member] Limited Partnerships Changes in carrying amount Goodwill [Roll Forward] LIABILITIES & STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Australia AUSTRALIA Other Commitments [Table] Other Commitments [Table] Trade Names Trade Names [Member] Schedule of Assets Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurement Fair Value Disclosures [Text Block] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities PEO Name PEO Name Geographical [Axis] Geographical [Axis] Cash payments for income taxes Income Tax Paid, before Refund Received Tuition Cap [Roll Forward] Tuition Cap [Roll Forward] Tuition Cap Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Schedule of Other Assets [Table] Schedule of Other Assets [Table] Schedule of Other Assets [Table] Other Commitments [Line Items] Other Commitments [Line Items] Tax benefit Share-Based Payment Arrangement, Expense, Tax Benefit Payments Payments for Restructuring Cash, cash equivalents, and restricted cash — beginning of period Cash, cash equivalents, and restricted cash — end of period Total cash, cash equivalents, and restricted cash shown in the statement of cash flows Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Stock-based compensation, Restructuring costs Stock Based Compensation Restructuring Costs Stock Based Compensation Restructuring Costs Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Finite-lived and Indefinite-lived Intangible Assets by Major Class [Line Items] Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Restricted cash included in other current assets Restricted Cash and Cash Equivalent, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Debt Instrument [Axis] Debt Instrument [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Ownership percentage Equity Method Investment, Ownership Percentage Stock-based compensation Stock-based compensation expense included in operating expense Share-Based Payment Arrangement, Noncash Expense Tuition Receivable and Allowance for Credit Losses Credit Loss, Financial Instrument [Policy Text Block] Investment, Name [Domain] Investment, Name [Domain] Maturities of held-to-maturity securities Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Basic (in dollars per share) Earnings Per Share, Basic Repurchase of common stock Payments for Repurchase of Common Stock Contract liabilities Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Tuition receivable, net Tuition receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Number of borrower defense applications to date Number Of Borrower Defense Applications To Date Number Of Borrower Defense Applications To Date Cover [Abstract] Cover [Abstract] Amendment to the Credit Facility, Subfacility for Borrowings in Foreign Currencies Amendment to the Credit Facility, Subfacility for Borrowings in Foreign Currencies [Member] Amendment to the Credit Facility, Subfacility for Borrowings in Foreign Currencies Currency translation adjustments Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Gross realized gain (loss) related to the sale of marketable securities Debt Securities, Available-for-Sale, Realized Gain (Loss) Total liabilities and stockholders’ equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] Restructuring costs Restructuring costs Restructuring Charges Schedule of Tuition Receivable and Allowance for Credit Losses Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Noncash or Part Noncash Divestiture, Name [Domain] Noncash or Part Noncash Divestiture, Name [Domain] Loss contingency Loss Contingency Accrual, Loss (Reversal of Loss) Restricted cash included in other assets Restricted Cash and Cash Equivalent, Noncurrent Purchases of held-to-maturity securities Payments to Acquire Held-to-Maturity Securities Other income (expense) Other (expense) income Other Nonoperating Income (Expense) Long-Term Debt Long-Term Debt [Text Block] Schedule of Accounts Payables and Accrued Expenses Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Income taxes receivable Income Taxes Receivable, Current Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] General and administration General and Administrative Expense Schedule of Proceeds from the Maturities of Marketable Securities Schedule of Realized Gain (Loss) [Table Text Block] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Adjustment to Compensation: Adjustment to Compensation [Axis] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Benefit redeemed Contract With Customer, Liability, Revenue Recognized, Learn And Earn Scholarship Contract With Customer, Liability, Revenue Recognized, Learn And Earn Scholarship Credit Facility [Axis] Credit Facility [Axis] Restructuring and Related Charges Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets at fair value on a recurring basis Assets, Fair Value Disclosure Capital contributions Payments to Acquire Limited Partnership Interests Name Measure Name Tuition, net of discounts, grants and scholarships Tuition Grants And Scholarship [Member] Represents information pertaining to Tuition, Grants And scholarship Income Taxes Income Tax Disclosure [Text Block] Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Intangible Asset, Indefinite-Lived, Class [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Impairments Impairment of goodwill Goodwill, Impairment Loss Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Distributions Proceeds from Equity Method Investment, Distribution Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Balance at beginning of period Balance at end of period Contract With Customer, Liability, Current, Learn And Earn Scholarship Contract With Customer, Liability, Current, Learn And Earn Scholarship Currency translation adjustments Intangible Asset, Indefinite-Lived, Foreign Currency Translation, Gain (Loss) Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Foreign Currency Translation and Transaction Gains and Losses Foreign Currency Transactions and Translations Policy [Policy Text Block] Entity Address, Address Line One Entity Address, Address Line One Right-of-use lease assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Provision for income taxes Income tax expense Income Tax Expense (Benefit) Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Award Timing Method Award Timing Method [Text Block] Financial Statement Presentation Consolidation, Policy [Policy Text Block] Net decrease in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forecast Forecast [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Number of borrower defense applications submitted received for repayment Number Of Borrower Defense Applications Received For Repayment Number Of Borrower Defense Applications Received For Repayment Net income Net income Net income Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Debt financing costs Unamortized Debt Issuance Expense Finite-lived and Indefinite-lived Intangible Assets by Major Class [Table] Finite Lived And Indefinite Lived Intangible Assets By Major Class [Table] Disclosure of finite-lived and indefinite-lived intangible assets, excluding goodwill, in total and by major class. Statement [Table] Statement [Table] Unallocated expenses Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Number of successfully completed courses Number Of Successfully Completed Courses Represents the number of successfully completed courses. Restatement Determination Date: Restatement Determination Date [Axis] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Schedule of Learn and Earn Liability and Tuition Cap Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Schedule of Other Assets Schedule of Other Assets [Table Text Block] Impairment charges Debt Securities, Available-for-sale, Impairment Expense Debt Securities, Available-for-sale, Impairment Expense Regulation [Abstract] Regulation [Abstract] Regulation Abstract Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]