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Accounts Receivable Accounts Receivable (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2020	Jul. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, Practical Expedient, Financing Component [true false]	true
Accounts Receivable, before Allowance for Credit Loss, Current	$ 352,265	$ 372,207
Less: Allowance for doubtful accounts	6,021	4,942
Accounts receivable, net	346,244	367,265
Advance charges receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	270,289	280,835
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	79,078	89,274
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	$ 2,898	$ 2,098

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