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Summary of Significant Accounting Policies, Recently Issued and Recently Adopted Accounting Standards (Tables)
 12 Months Ended
Apr. 30, 2020
Summary of Significant Accounting Policies, Recently Issued, and Recently Adopted Accounting Standards [Abstract]  
Net Sales Return Reserves by Balance Sheet Account
The reserves are reflected in the following accounts of the Consolidated Statements of Financial Position – increase (decrease):

  
2020
    
2019
  
Increase in Inventories, net
  
$
8,686
    
$
3,739
  
Decrease in Accrued royalties
  
$
(4,441
)
  
$
(3,653
)
Increase in Contract liabilities
  
$
32,769
    
$
25,934
  
Print book sales return reserve net liability balance
  
$
(19,642
)
  
$
(18,542
)