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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, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018	Jul. 31, 2018
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	$ 484,898	$ 459,106	$ 946,266	$ 878,274
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			705		(7,252)
Cumulative loss on foreign currency translation, ending balance	(107,223)		(107,223)		$ (107,928)
Service revenues
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	416,807	401,954	811,613	776,079
Vehicle sales
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	$ 68,091	$ 57,152	$ 134,653	$ 102,195

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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