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Accounts Receivable Accounts Receivable (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2021	Jul. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue, Practical Expedient, Financing Component [true false]	true
Accounts Receivable, before Allowance for Credit Loss, Current	$ 440,197	$ 356,597
Less: Allowance for credit loss	5,324	6,390
Accounts receivable, net	434,873	350,207
Advance charges receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	337,758	260,196
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	99,584	94,281
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	$ 2,855	$ 2,120

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