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Product Development Assets (Details) - USD ($)
$ in Thousands
Apr. 30, 2022
Apr. 30, 2021
Product Development Assets [Abstract]    
Product development assets, net $ 41,458 $ 49,517
Accumulated amortization 269,700 269,000
Book Composition Costs [Member]    
Product Development Assets [Abstract]    
Product development assets, net 20,574 20,474
Work in process 4,400 6,300
Software Costs [Member]    
Product Development Assets [Abstract]    
Product development assets, net 17,479 23,262
Content Development Costs [Member]    
Product Development Assets [Abstract]    
Product development assets, net $ 3,405 $ 5,781