v3.26.1
Debt, Net - Summary of Debt (Detail) - USD ($)
$ in Millions
May 31, 2026
Aug. 31, 2025
Debt Instrument [Line Items]    
Debt, net $ 1,805.6 $ 1,750.9
Nonrecourse    
Debt Instrument [Line Items]    
Credit facilities 0.0 222.3
Debt, gross 1,086.2 986.7
Debt discount and issuance costs (13.9) (7.0)
Debt, net 1,072.3 979.7
Recourse    
Debt Instrument [Line Items]    
Credit facilities 121.4 152.6
Other notes payable 2.5 1.4
Debt, gross 738.3 777.8
Debt discount and issuance costs (5.0) (6.6)
Debt, net 733.3 771.2
North American | Recourse    
Debt Instrument [Line Items]    
Credit facilities 0.0 5.0
Europe | Recourse    
Debt Instrument [Line Items]    
Credit facilities 101.4 77.6
Mexico | Recourse    
Debt Instrument [Line Items]    
Credit facilities 20.0 70.0
Corporate Senior Term Debt | Recourse    
Debt Instrument [Line Items]    
Debt, gross 240.6 250.0
2.875% Convertible senior notes, due 2028 | Recourse    
Debt Instrument [Line Items]    
Debt, gross 373.8 373.8
Leasing Senior Term Debt | Nonrecourse    
Debt Instrument [Line Items]    
Debt, gross 300.0 308.2
Leasing GBXL I Asset-backed Term Notes | Nonrecourse    
Debt Instrument [Line Items]    
Debt, gross 743.5 456.2
European Debt | Nonrecourse    
Debt Instrument [Line Items]    
Debt, gross $ 42.7 $ 0.0