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Product Development Assets (Details) - USD ($)
$ in Thousands
Apr. 30, 2023
Apr. 30, 2022
Property, Plant and Equipment [Line Items]    
Product development assets, net $ 32,321 $ 41,458
Accumulated amortization 297,400 269,700
Book composition costs    
Property, Plant and Equipment [Line Items]    
Product development assets, net 19,067 20,574
Work in process 7,400 4,400
Software costs    
Property, Plant and Equipment [Line Items]    
Product development assets, net 11,338 17,479
Content development costs    
Property, Plant and Equipment [Line Items]    
Product development assets, net $ 1,916 $ 3,405