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Accounts Receivable Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2019	Jul. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, Practical Expedient, Financing Component [true false]	false
Accounts Receivable, before Allowance for Credit Loss, Current	$ 399,693	$ 372,207
Less: Allowance for doubtful accounts	5,384	4,942
Accounts receivable, net	394,309	367,265
Advance charges receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	307,738	280,835
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	87,467	89,274
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	$ 4,488	$ 2,098

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