Summary of Significant Accounting Policies Disaggregation of Revenue (Details) - USD ($)	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability	$ 0
Service revenues and vehicle sales	2,205,583,000	$ 2,041,957,000	$ 1,805,695,000
Contract with Customer, Asset, after Allowance for Credit Loss	10,574,000	11,840,000
Increase (Decrease) in Contract with Customer, Asset	2,875,000	4,130,000
Capitalized Contract Cost, Amortization	(3,541,000)	(4,875,000)
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss)	172,000	(521,000)
Contract with Customer, Asset, after Allowance for Credit Loss	10,080,000	10,574,000	11,840,000
Cumulative Translation Adjustment Summary [Roll Forward]
Cumulative loss on foreign currency translation, Beginning balance	(132,529,000)	(107,928,000)
Gain (loss) on foreign currency translation	11,441,000	(24,601,000)
Cumulative loss on foreign currency translation, Ending balance	(121,088,000)	(132,529,000)	(107,928,000)
Service revenues
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales	1,947,140,000	1,755,694,000	1,578,502,000
Vehicle sales
Disaggregation of Revenue [Line Items]
Service revenues and vehicle sales	$ 258,443,000	$ 286,263,000	$ 227,193,000