Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross, current	$ 356,597	$ 372,207
Less: Allowance for doubtful accounts	(6,390)	(4,942)	$ (5,444)	$ (4,311)
Accounts receivable, net	350,207	367,265
Advance charges receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross, current	260,196	280,835
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross, current	94,281	89,274
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross, current	$ 2,120	$ 2,098