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Accounts Receivable Accounts Receivable (Details) - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 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	$ 469,359	$ 356,597
Less: Allowance for credit loss	6,954	6,390
Accounts receivable, net	462,405	350,207
Advance charges receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	368,360	260,196
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	98,412	94,281
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss, Current	$ 2,587	$ 2,120

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