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Summary of Significant Accounting Policies, Recently Issued and Recently Adopted Accounting Standards, Recently Adopted and Issued Accounting Standards (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2019
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Reconciliation of cash, cash equivalents and restricted cash reported within Condensed Consolidated Statement of Cash Flows [Abstract]                        
Cash and cash equivalents $ 92,890       $ 169,773       $ 92,890 $ 169,773 $ 58,516 $ 363,806
Restricted cash included in Prepaid expenses and other current assets 658       484       658 484 0 0
Total cash, cash equivalents, and restricted cash shown in the Consolidated Statement of Cash Flows [1] 93,548       170,257       93,548 170,257 58,516 $ 363,806
Assets [Abstract]                        
Accounts receivable, net 294,867 [2]       212,377       294,867 [2] 212,377    
Product development assets 62,470       78,814       62,470 78,814    
Technology, property and equipment, net 289,021       289,934       289,021 289,934 243,058  
Other non-current assets 97,308       85,802       97,308 85,802    
Liabilities [Abstract]                        
Accrued royalties 78,062       73,007       78,062 73,007    
Contract liability (Deferred revenue) 507,365 [2]       486,353       507,365 [2] 486,353    
Deferred income tax liabilities 143,775       143,518       143,775 143,518    
Retained earnings 1,931,074       1,834,057       1,931,074 1,834,057    
Accounts receivable, net 294,867 [2]       212,377       294,867 [2] 212,377    
Contract liability (Deferred revenue) 507,365 [2]       486,353       507,365 [2] 486,353    
Revenue, net 491,200 $ 449,400 $ 448,600 $ 410,900 477,300 $ 455,700 $ 451,700 $ 411,400 1,800,069 1,796,103 1,718,530  
Cost of sales [3]                 554,722 531,024 [4] 500,794 [4]  
Topic 606 [Member]                        
Liabilities [Abstract]                        
Amounts netted down from accounts receivable, net and deferred revenue         59,500         59,500    
Topic 606 [Member] | Adjustments due to Adoption [Member]                        
Assets [Abstract]                        
Accounts receivable, net         93,349         93,349    
Product development assets         (3,725)         (3,725)    
Technology, property and equipment, net         (361)         (361)    
Other non-current assets         5,274         5,274    
Liabilities [Abstract]                        
Accrued royalties         (731)         (731)    
Contract liability (Deferred revenue)         89,364         89,364    
Deferred income tax liabilities         1,400         1,400    
Retained earnings         4,503         4,503    
Accounts receivable, net         93,349         93,349    
Contract liability (Deferred revenue)         89,364         89,364    
Topic 606 [Member] | Balances without Adoption of Topic 606 [Member]                        
Assets [Abstract]                        
Accounts receivable, net [2],[5]         212,377         212,377    
Liabilities [Abstract]                        
Contract liability (Deferred revenue) [2],[5]         486,353         486,353    
Accounts receivable, net [2],[5]         212,377         212,377    
Contract liability (Deferred revenue) [2],[5]         486,353         486,353    
Topic 606 [Member] | Balances upon Adoption of Topic 606 [Member]                        
Assets [Abstract]                        
Accounts receivable, net         305,726         305,726    
Product development assets         75,089         75,089    
Technology, property and equipment, net         289,573         289,573    
Other non-current assets         91,076         91,076    
Liabilities [Abstract]                        
Accrued royalties         72,276         72,276    
Contract liability (Deferred revenue)         575,717         575,717    
Deferred income tax liabilities         144,918         144,918    
Retained earnings         1,838,560         1,838,560    
Accounts receivable, net         305,726         305,726    
Contract liability (Deferred revenue)         575,717         575,717    
Topic 606 [Member] | Sales Return Reserve Provision [Member]                        
Assets [Abstract]                        
Accounts receivable, net 25,900       28,300       25,900 28,300    
Liabilities [Abstract]                        
Contract liability (Deferred revenue) 25,900       28,300       25,900 28,300    
Accounts receivable, net 25,900       28,300       25,900 28,300    
Contract liability (Deferred revenue) 25,900       $ 28,300       25,900 28,300    
ASU 2017-07 Member]                        
Recently Adopted Accounting Standards [Abstract]                        
Net charges benefits (cost)                 8,800 8,100 (5,300)  
ASU 2017-07 Member] | Operating and Administrative Expenses [Member]                        
Recently Adopted Accounting Standards [Abstract]                        
Net charges benefits (cost)                   8,100    
ASU 2017-07 Member] | Operating and Administrative Expenses [Member] | Plan [Member]                        
Recently Adopted Accounting Standards [Abstract]                        
Net charges benefits (cost)                   (5,300) (5,300)  
ASU 2017-07 Member] | Interest and Other Income [Member]                        
Recently Adopted Accounting Standards [Abstract]                        
Net charges benefits (cost)                     (5,300)  
ASU 2017-07 Member] | Interest and Other Income [Member] | Plan [Member]                        
Recently Adopted Accounting Standards [Abstract]                        
Net charges benefits (cost)                 8,800 8,100 $ 8,100  
ASU 2016-18 [Member]                        
Recently Adopted Accounting Standards [Abstract]                        
Reduction in cash used in operating activities                   $ (500)    
ASU 2016-02 [Member] | Minimum [Member]                        
Assets and Liabilities, Lessee [Abstract]                        
Operating lease, liability 175,000               175,000      
Operating lease, right-of-use asset 135,000               135,000      
ASU 2016-02 [Member] | Maximum [Member]                        
Assets and Liabilities, Lessee [Abstract]                        
Operating lease, liability 185,000               185,000      
Operating lease, right-of-use asset $ 145,000               $ 145,000      
[1] Due to the retrospective adoption of ASU 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash," we are now required to include restricted cash as part of the change in cash, cash equivalents, and restricted cash. As a result, amounts which were previously classified as cash flows from operating activities have been reclassified as they are recognized in the total change in cash, cash equivalents and restricted cash. Refer to Note 2, "Summary of Significant Accounting Policies, Recently Issued, and Recently Adopted Accounting Standards," in the Notes to Consolidated Financial Statements for more information.
[2] Due to the adoption of the new revenue standard, the sales return reserve as of April 30, 2019 of $25.9 million is recorded in Contract Liability (Deferred Revenue). In prior periods, it was recorded as a reduction to Accounts Receivable, net on the Consolidated Statements of Financial Position. At April 30, 2018 the sales return reserve was $28.3 million.
[3] In connection with the acquisition of The Learning House, Inc. ("Learning House"), we changed our accounting policy for certain advertising and marketing costs incurred by our Education Services business to fulfill performance obligations from contracts with educational institutions. Under the new accounting policy, these costs are included in Cost of Sales whereas they were previously included in Operating and Administrative Expenses on the Consolidated Statements of Income. Including these expenses in Cost of Sales will better align these costs with the related revenue and conform with the presentation of such costs for Learning House. This change in accounting policy was applied retrospectively. The Consolidated Statements of Income for the years ended April 30, 2018, and 2017 have been reclassified to reflect this change in accounting policy. The impact of this reclassification was an increase to Cost of Sales and a corresponding decrease to Operating and Administrative Expenses of $45.8 million and $40.0 million for the years ended April 30, 2018, and 2017, respectively. This reclassification had no impact on Revenue, net, Operating Income, Net Income, or Earnings per Share. Refer to "Change in Accounting Policy" in Note 2, "Summary of Significant Accounting Policies, Recently Issued, and Recently Adopted Accounting Standards," for more information on the accounting policy change and Note 4, "Acquisition," in the Notes to Consolidated Financial Statements for more information related to the acquisition of Learning House.
[4] Due to the retrospective adoption of Accounting Standards Update ("ASU") 2017-07, "Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost,", total net benefits (costs) of $8.1 million and $(5.3) million related to the non-service components of defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest and Other Income (Expense) for the years ended April 30, 2018 and 2017, respectively. Total net benefits (costs) related to the non-service components of defined benefit and other post-employment benefit plans were $8.8 million for the year ended April 30, 2019. Refer to Note 2, "Summary of Significant Accounting Policies, Recently Issued, and Recently Adopted Accounting Standards, in the Notes to Consolidated Financial Statements for more information.
[5] As noted above, prior period amounts have not been adjusted due to adoption of the new revenue standard under the modified retrospective method.