Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for doubtful accounts	$ (4,120)	$ (2,988)	$ (3,584)	$ (2,683)
Accounts receivable, gross, current	270,390	218,684
Accounts receivable, net	266,270	215,696
Advance charges receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross, current	182,824	143,724
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross, current	86,455	73,773
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross, current	$ 1,111	$ 1,187