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Asset Backed Securities - Additional Information (Details) - USD ($) $ in Millions | Feb. 09, 2022 | May 31, 2022 | Aug. 31, 2021
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Debt issuance costs, net |  | $ 7.8 | $ 8.6
GBX Leasing |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Principal amount | $ 323.3 |  |
Debt issuance costs, net | $ 5.0 |  |
Debt instrument, maturity year | 2052 |  |
Debt instruments additional interest rate per annum | 4.00% |  |
GBX Leasing | GBXL I Series 2022-1 Class A Secured Railcar Equipment Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Principal amount | $ 302.6 |  |
Debt instrument, interest rate | 2.87% |  |
Debt instrument maturity date | Feb. 20, 2052 |  |
GBX Leasing | GBXL I Series 2022-1 Class B Secured Railcar Equipment Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt, Principal amount | $ 20.7 |  |
Debt instrument, interest rate | 3.45% |  |
Debt instrument maturity date | Feb. 20, 2052 |  |

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