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Description of Business and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Jul. 31, 2020
Disaggregation of Revenue [Line Items]          
Service revenues and vehicle sales: $ 617,031 $ 575,140 $ 1,209,971 $ 1,129,564  
Cumulative Translation Adjustment Summary [Roll Forward]          
Cumulative loss on foreign currency translation, beginning balance     (121,088) (132,529) $ (132,529)
(Loss) Gain on foreign currency translation     14,368   11,441
Cumulative loss on foreign currency translation, ending balance (106,720)   (106,720)   $ (121,088)
Service revenues          
Disaggregation of Revenue [Line Items]          
Service revenues and vehicle sales: 532,601 510,034 1,047,973 997,890  
Vehicle sales          
Disaggregation of Revenue [Line Items]          
Service revenues and vehicle sales: $ 84,430 $ 65,106 $ 161,998 $ 131,674