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Product Development Assets (Tables)
12 Months Ended
Apr. 30, 2020
Product Development Assets [Abstract]  
Product Development Assets
Product development assets consisted of the following at April 30:
 
2020
   
2019
 
Book Composition Costs
 
$
18,744
   
$
19,197
 
Software Costs
   
28,995
     
38,048
 
Content Development Costs
   
5,904
     
5,225
 
Total
 
$
53,643
   
$
62,470