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Revolving Notes - Schedule of Credit Facility Balances (Detail) - USD ($)
$ in Millions
May 31, 2022
Aug. 31, 2021
Line of Credit Facility [Line Items]    
Revolving notes $ 303.3 $ 372.2
Revolving Notes | North America    
Line of Credit Facility [Line Items]    
Revolving notes 160.0 160.0
Revolving Notes | Mexico    
Line of Credit Facility [Line Items]    
Revolving notes 85.0 15.0
Revolving Notes | Europe    
Line of Credit Facility [Line Items]    
Revolving notes $ 58.3 50.2
GBX Leasing    
Line of Credit Facility [Line Items]    
Revolving notes   $ 147.0