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Customer Receivables (Components Of Customer Receivables ) (Details) - USD ($)
$ in Thousands
Jan. 31, 2020
Apr. 30, 2019
Accounts Receivable, Net [Abstract]    
Gross customer receivables $ 128,815 $ 132,145
Less:    
Allowance for doubtful accounts (460) (249)
Allowance for returns and discounts (6,002) (5,995)
Net customer receivables $ 122,353 $ 125,901