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Asset Backed Securities - Summary of Net Carrying Amount of Assets Transferred and Related Debt (Detail) - USD ($)
$ in Millions
Aug. 31, 2023
Aug. 31, 2022
Aug. 31, 2021
Assets      
Restricted cash $ 21.0 $ 16.1 $ 24.6
Equipment on operating leases, net 1,000.0 770.9  
Liabilities      
Notes payable, net 1,311.7 1,269.1  
GBX Leasing      
Assets      
Restricted cash 6.7 6.9  
Equipment on operating leases, net 388.9 401.8  
Liabilities      
Notes payable, net $ 302.1 $ 312.8