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Debt, Net - Summary of Net Carrying Amount of Assets Transferred and Related Debt (Detail) - USD ($) $ in Millions	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2023
Assets
Restricted cash	$ 20.3	$ 16.8	$ 21.0
Equipment on operating leases, net	1,328.5	1,243.5
Liabilities
Debt, net	1,750.9	1,755.8
Nonrecourse
Liabilities
Debt, net	979.7	978.9
Leasing GBXL I Asset-backed Term Notes
Assets
Restricted cash	7.6	0.3
Equipment on operating leases, net	609.7	651.0
Leasing GBXL I Asset-backed Term Notes | Nonrecourse
Liabilities
Debt, net	$ 449.6	$ 464.5

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