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Product Development Assets (Tables)
12 Months Ended
Apr. 30, 2021
Product Development Assets [Abstract]  
Product Development Assets
Product development assets, net consisted of the following at April 30:
 
2021
   
2020
 
Book composition costs
 
$
20,474
   
$
18,744
 
Software costs
   
23,262
     
28,995
 
Content development costs
   
5,781
     
5,904
 
Product development assets, net
 
$
49,517
   
$
53,643