Cash, Cash Equivalents, and Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Jul. 31, 2018	Oct. 31, 2017	Jul. 31, 2017
Cash, Cash Equivalents, and Restricted Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 59,313	$ 68,089
Restricted cash included in other current assets	544	285
Cash and cash equivalents included in current assets held for sale (see Note 4)	4,906	5,892
Restricted cash and cash equivalents included in current assets held for sale (see Note 4)	130,738	128,931
Total cash, cash equivalents, and restricted cash and cash equivalents	$ 195,501	$ 203,197	$ 160,721	$ 211,963