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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, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Jul. 31, 2020
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	$ 733,910	$ 550,360	$ 1,943,881	$ 1,679,924
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			19,424		11,441
Cumulative loss on foreign currency translation, ending balance	(101,664)		(101,664)		$ (121,088)
Service revenues
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	623,846	491,582	1,671,819	1,489,472
Vehicle sales
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales:	$ 110,064	$ 58,778	$ 272,062	$ 190,452

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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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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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