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Summary of Significant Accounting Policies, Recently Issued and Recently Adopted Accounting Standards (Tables)
 12 Months Ended
Apr. 30, 2018
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 – (decrease) increase as of April 30:

  
2018
  
2017
 
Accounts Receivable
 
$
(28,302
)
 
$
(34,769
)
Inventories
 
$
4,626
  
$
4,727
 
Royalties Payable
 
$
(5,048
)
 
$
(5,741
)
Decrease in Net Assets
 
$
(18,628
)
 
$
(24,300
)