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Cash, Cash Equivalents, and Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Apr. 30, 2020
Jul. 31, 2019
Apr. 30, 2019
Jul. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 51,786 $ 80,168    
Restricted cash and cash equivalents 114,667 177,031    
Total cash, cash equivalents, and restricted cash and cash equivalents $ 166,453 $ 257,199 $ 242,174 $ 203,197