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Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross, current	$ 372,207	$ 357,045
Less allowance for doubtful accounts	(4,942)	(5,444)	$ (4,311)	$ (4,120)
Accounts receivable, net	367,265	351,601
Advance charges receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross, current	280,835	230,092
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross, current	89,274	125,255
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross, current	$ 2,098	$ 1,698

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