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Debt, Net - Debt, Net (Detail) - USD ($) $ in Millions	Aug. 31, 2025	Aug. 31, 2024
Debt Instrument [Line Items]
Debt, gross	$ 1,764.5
Debt, net	1,750.9	$ 1,755.8
Nonrecourse
Debt Instrument [Line Items]
Credit facilities	222.3	194.9
Debt, gross	986.7	987.0
Debt discount and issuance costs	(7.0)	(8.1)
Debt, net	979.7	978.9
Recourse
Debt Instrument [Line Items]
Credit facilities	152.6	156.7
Other notes payable	1.4	3.3
Debt, gross	777.8	785.5
Debt discount and issuance costs	(6.6)	(8.6)
Debt, net	771.2	776.9
North American | Recourse
Debt Instrument [Line Items]
Credit facilities	5.0	0.0
Europe | Recourse
Debt Instrument [Line Items]
Credit facilities	77.6	46.7
Mexico | Recourse
Debt Instrument [Line Items]
Credit facilities	70.0	110.0
Corporate Senior Term Debt | Recourse
Debt Instrument [Line Items]
Debt, gross	250.0	251.7
2.875% Convertible senior notes, due 2028 | Recourse
Debt Instrument [Line Items]
Debt, gross	373.8	373.8
Leasing GBXL I Asset-backed Term Notes | Nonrecourse
Debt Instrument [Line Items]
Debt, gross	456.2	471.6
Leasing Senior Term Debt | Nonrecourse
Debt Instrument [Line Items]
Debt, gross	$ 308.2	$ 320.5

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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