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Cash, Cash Equivalents, and Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Oct. 31, 2019
Jul. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 62,183 $ 80,168    
Restricted cash and cash equivalents 190,218 177,031    
Total cash, cash equivalents, and restricted cash and cash equivalents $ 252,401 $ 257,199 $ 195,501 $ 203,197