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Description of Business and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Jul. 31, 2019
Disaggregation of Revenue [Line Items]      
Service revenues and vehicle sales: $ 554,424 $ 461,368  
Cumulative Translation Adjustment Summary [Roll Forward]      
Cumulative loss on foreign currency translation, beginning balance (132,529) (107,928) $ (107,928)
(Loss) Gain on foreign currency translation 13,239   (24,601)
Cumulative loss on foreign currency translation, ending balance (119,290)   $ (132,529)
Service revenues      
Disaggregation of Revenue [Line Items]      
Service revenues and vehicle sales: 487,856 394,806  
Vehicle sales      
Disaggregation of Revenue [Line Items]      
Service revenues and vehicle sales: $ 66,568 $ 66,562