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Number of shares available for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Fixed Income Securities and Cash Fixed Income Securities and Cash [Member] This element represents an investment that provides a return in the form of fixed periodic payments and eventual return of principal at maturity. Also includes plan assets held in cash. 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Impairment of goodwill Impairment of goodwill Impairment of goodwill Goodwill, Impairment Loss Term of supplemental retirement benefits Term of supplemental retirement benefits The period of time subsequent to termination of employment during which the company provides for the payment of supplemental retirement benefits for certain officers and senior management, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Increase in Contract liabilities Increase (Decrease) in Contract with Customer, Contract Liability Amount of increase (decrease) in obligation related to contract liability for which consideration has been received or is receivable. 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Amortization of product development assets Amortization expense Amortization of Product Development Assets The charge against earnings in the period representing the amortization of product development assets, which consist of composition costs and royalty advances to authors. 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Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Lender Name [Axis] Lender Name [Axis] Operating lease right-of-use assets Operating lease ROU assets Operating Lease, Right-of-Use Asset Buildings and Leasehold Improvements Buildings and leasehold improvements Building and Leasehold Improvements [Member] Long lived, depreciable structure held for productive use and any addition, improvement, or renovation to the structure, such as interior masonry, interior flooring, electrical, and plumbing, including additions or improvements to assets held under a lease arrangement. 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Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Unrealized gain (loss) on interest rate swaps, net of tax (expense) benefit of $(614), $1,450, and $(663), respectively Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Weighted Average Weighted Average [Member] Leases Lessee, Leases [Policy Text Block] Amortization of intangible assets Amortization of Intangible Assets Operating and administrative expenses Selling, General and Administrative Expense Deferred tax assets Deferred Income Tax Assets, Net Schedule of Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Total depreciation and amortization Depreciation, Depletion and Amortization Global equity securities: Limited Partnership Defined Benefit Plan, Equity Securities, Non-US, Limited Partnership [Member] Security representing ownership in limited partnership, not domiciled in United States of America (US), for which ownership is represented by share of stock; in which defined benefit plan asset is invested. Includes, but is not limited to, common stock, preferred stock, convertible security, stock right and stock warrant. Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract] Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract] Accrued royalties Accrued Royalties, Current Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Finished goods Inventory, Finished Goods, Gross Term loan A - Amended and Restated CA Revolving Credit Facility [Member] Statutory tax rate difference Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Arrangement Duration Trading Arrangement Duration Computer Hardware Computer hardware Computer Equipment [Member] Segments [Axis] Segments [Axis] Revolving Credit Facility Through November 2027 Revolving Credit Facility Through November 2027 [Member] Revolving Credit Facility Through November 2027 Local Phone Number Local Phone Number Share-based Compensation Award, Tranche Four Share-based Compensation Award, Tranche Four [Member] Fourth portion of share-based compensation award differentiated by a particular vesting feature, including, but not limited to, performance measure or service period. Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Fair value of common stock on grant date (in dollars per share) Share Price Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Assets: Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Debt Instrument [Axis] Debt Instrument [Axis] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Operating lease liabilities arising from obtaining ROU assets Operating Lease, Increase Decrease in Lease Liability The increase (decrease) during the reporting period in the aggregate amount of lease liabilities. 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Restatement Determination Date: Restatement Determination Date [Axis] International Deferred Foreign Income Tax Expense (Benefit) Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Schedule of Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] Reporting Unit [Axis] Reporting Unit [Axis] Accumulated impairment Finite Lived Intangible Assets Impaired Accumulated Impairment Loss Amount of accumulated impairment loss for an asset lacking physical substance and having a projected finite period of benefit. 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NAV Fair Value Measured at Net Asset Value Per Share [Member] Schedule of ROU Assets and Lease Liabilities Lessee, Operating Lease, Right of Use Assets and Liabilities [Table Text Block] Tabular disclosure of information relating to lessee's right-of-use assets and liabilities. Business Combination [Axis] Business Combination [Axis] Accounting Standards Update and Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Employee retirement age limit under retirement plans Employee retirement age limit under retirement plans Refers to the employee retirement age limit under retirement plans based on length of service and compensation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. 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Transferred at Point in Time Transferred at Point in Time [Member] Name Forgone Recovery, Individual Name Restructuring reserve, noncurrent Restructuring Reserve, Noncurrent Share-based compensation arrangement by share-based payment award, expiration period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Debt, weighted average interest rate Debt, Weighted Average Interest Rate Foreign Translation Adjustment Goodwill, Foreign Currency Translation, Gain (Loss) Defined Benefit Plan, Equity Securities Defined Benefit Plan, Equity Securities [Member] Book composition costs Book Composition Costs [Member] The costs incurred to bring an edited commercial manuscript to publication, which include typesetting, proofreading, design, illustration costs, and digital formatting. They are capitalized and are generally amortized on a double-declining basis over their estimated useful lives. 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Capital Stock and Changes in Capital Accounts Equity [Text Block] State and local Deferred State and Local Income Tax Expense (Benefit) Change in shares due to performance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Change in shares due to performance, Weighted Average Grant Date Fair Value The weighted average fair value at grant date for nonvested equity-based awards that changed due to performance during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). 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