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Product Development Assets
 12 Months Ended
Apr. 30, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Product Development Assets Product Development Assets
Product development assets, net were included in Other non-current assets on the Consolidated Statements of Financial Position and consisted of the following at April 30:
20242023
Book composition costs$213,811 $223,944 
Software costs52,415 94,054 
Content development costs596 11,692 
Product development assets, gross266,822 329,690 
Accumulated amortization(249,183)(297,369)
Product development assets, net$17,639 $32,321 
Amortization expense for product development assets for the years ended April 30, 2024, 2023, and 2022 was $22.8 million, $32.4 million, and $35.2 million, respectively.
Product development assets include $2.3 million and $7.4 million of work-in-process as of April 30, 2024 and 2023, respectively, primarily for book composition costs.