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Summary of Significant Accounting Policies Disaggregation of Revenue (Details) - USD ($) | 12 Months Ended
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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

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