Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Jul. 31, 2023	Jul. 31, 2022
Deferred tax assets:
Allowance for credit loss	$ 1,505	$ 1,210
Accrued compensation and benefits	17,008	16,965
Operating lease liabilities	22,891	24,379
Accrued other	2,212	5,053
Deferred revenue	5,349	4,560
Losses carried forward	41,589	29,936
Federal tax benefit	14,798	14,542
Total gross deferred tax assets	105,352	96,645
Less: Valuation allowance	(40,346)	(29,171)
Net deferred tax assets	65,006	67,474
Deferred tax liabilities:
Vehicle pooling costs	(25,808)	(23,655)
Property and equipment	(70,086)	(72,975)
Operating lease right-of-use assets	(23,169)	(24,369)
Other prepaids	(2,548)	(728)
Intangibles and goodwill	(33,150)	(25,431)
Total gross deferred tax liabilities	(154,761)	(147,158)
Net deferred tax liabilities	$ (89,755)	$ (79,684)