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Product Development Assets
 12 Months Ended
Apr. 30, 2020
Product Development Assets [Abstract]  
Product Development Assets
Note 9 – 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
  

Product development assets include $4.9 million and $4.3 million of work-in-process as of April 30, 2020 and 2019, respectively, mainly for book composition costs.

Product development assets are net of accumulated amortization of $244.1 million and $236.5 million as of April 30, 2020 and 2019, respectively.