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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Costs and Expenses      
Cost of sales [1] $ 554,722 $ 531,024 [2] $ 500,794 [2]
Operating and administrative expenses [1],[2] 963,582 956,822 943,242
Change in Accounting Policy for Certain Advertising and Marketing Costs [Member] | The Learning House, Inc. [Member]      
Costs and Expenses      
Cost of sales   45,800 40,000
Operating and administrative expenses   (45,800) (40,000)
ASU 2017-07 Member]      
Costs and Expenses      
Net charges benefits (cost) $ 8,800 $ 8,100 $ (5,300)
[1] 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.
[2] 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.