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Accounts Receivable (Tables)
9 Months Ended
Apr. 30, 2020
Accounts Receivable [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts receivable, net consisted of:
(In thousands)April 30, 2020July 31, 2019
Advance charges receivable$270,289  $280,835  
Trade accounts receivable79,078  89,274  
Other receivables2,898  2,098  
352,265  372,207  
Less: Allowance for doubtful accounts(6,021) (4,942) 
Accounts receivable, net$346,244  $367,265