Description of Business and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Jul. 31, 2019
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	$ 550,360	$ 553,116	$ 1,679,924	$ 1,499,382
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			(6,394)		(24,601)
Cumulative loss on foreign currency translation, ending balance	(138,923)		(138,923)		$ (132,529)
Service revenues
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	491,582	473,682	1,489,472	1,285,295
Vehicle sales
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	$ 58,778	$ 79,434	$ 190,452	$ 214,087