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Product Development Assets (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Apr. 30, 2020
Product Development Assets [Abstract]    
Product development assets, net $ 49,517 $ 53,643
Accumulated amortization 269,000 244,100
Book Composition Costs [Member]    
Product Development Assets [Abstract]    
Product development assets, net 20,474 18,744
Work in process 6,300 4,900
Software Costs [Member]    
Product Development Assets [Abstract]    
Product development assets, net 23,262 28,995
Content Development Costs [Member]    
Product Development Assets [Abstract]    
Product development assets, net $ 5,781 $ 5,904