v3.26.3
Debt, Net - Debt, Net (Detail) - USD ($)
$ in Millions
Aug. 31, 2026
Aug. 31, 2025
Debt Instrument [Line Items]    
Debt, gross $ 1,855.3  
Debt, net 1,837.4 $ 1,750.9
Nonrecourse    
Debt Instrument [Line Items]    
Credit facilities 0.0 222.3
Debt, gross 1,079.0 986.7
Debt discount and issuance costs (13.5) (7.0)
Debt, net 1,065.5 979.7
Recourse    
Debt Instrument [Line Items]    
Credit facilities 162.8 152.6
Other notes payable 2.2 1.4
Debt, gross 776.3 777.8
Debt discount and issuance costs (4.4) (6.6)
Debt, net 771.9 771.2
North American | Recourse    
Debt Instrument [Line Items]    
Credit facilities 50.0 5.0
Europe | Recourse    
Debt Instrument [Line Items]    
Credit facilities 92.8 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 237.5 250.0
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 738.9 456.2
Leasing GBXL I Asset-backed Term Notes | Nonrecourse | GBXL I 2022 Class A Notes [Member]    
Debt Instrument [Line Items]    
Debt, gross 250.2 262.6
Leasing GBXL I Asset-backed Term Notes | Nonrecourse | GBXL I 2022 Class B Notes [Member]    
Debt Instrument [Line Items]    
Debt, gross 20.7 20.7
Leasing GBXL I Asset-backed Term Notes | Nonrecourse | GBXL I 2023 Class A Notes [Member]    
Debt Instrument [Line Items]    
Debt, gross 150.7 153.7
Leasing GBXL I Asset-backed Term Notes | Nonrecourse | GBXL I 2023 Class B Notes [Member]    
Debt Instrument [Line Items]    
Debt, gross 19.0 19.2
Leasing GBXL I Asset-backed Term Notes | Nonrecourse | GBXL I 2026 Class A Notes [Member]    
Debt Instrument [Line Items]    
Debt, gross 278.7
Leasing GBXL I Asset-backed Term Notes | Nonrecourse | GBXL I 2026 Class B Notes [Member]    
Debt Instrument [Line Items]    
Debt, gross 19.6
Leasing Senior Term Debt | Nonrecourse    
Debt Instrument [Line Items]    
Debt, gross 297.4 308.2
European Debt | Nonrecourse    
Debt Instrument [Line Items]    
Debt, gross $ 42.7