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Asset Backed Securities - Summary of Net Carrying Amount of Assets Transferred and Related Debt (Details) - USD ($) $ in Millions | May 31, 2022 | Aug. 31, 2021 | May 31, 2021
--- | --- | --- | ---
Assets [Abstract] |  |  |
Restricted cash | $ 16.1 | $ 24.6 | $ 8.7
Equipment on operating leases, net | 676.1 | 609.8 |
Liabilities [Abstract] |  |  |
Notes payable, net | 1,202.6 | $ 826.5 |
GBX Leasing |  |  |
Assets [Abstract] |  |  |
Restricted cash | 7.0 |  |
Equipment on operating leases, net | 406.4 |  |
Liabilities [Abstract] |  |  |
Notes payable, net | $ 315.7 |  |

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