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Description of Business and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2018
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	$ 553,116	$ 478,198	$ 1,499,382	$ 1,356,472
Cumulative Translation Adjustment Summary [Roll Forward]
Cumulative loss on foreign currency translation, beginning balance			(107,928)	(100,676)	$ (100,676)
(Loss) Gain on foreign currency translation			(5,263)		(7,252)
Cumulative loss on foreign currency translation, ending balance	(113,191)		(113,191)		$ (107,928)
Service revenues
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	473,682	410,762	1,285,295	1,186,841
Vehicle sales
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	$ 79,434	$ 67,436	$ 214,087	$ 169,631