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v3.24.2

Notes Payable, Net - Additional Information (Detail) - USD ($) $ in Millions |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 20, 2023 | May 31, 2024 | Feb. 01, 2024 | Aug. 31, 2023 | May 31, 2023
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument amount outstanding |  | $ 1,431.5 |  | $ 1,329.9 |
Debt issuance costs, net |  | 5.6 |  | 6.3 |
Leasing Nonrecourse Term Loans | Nonrecourse Senior Term Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Principal amount |  | 343.0 |  |  |
Debt instrument amount outstanding |  | 323.5 |  |  |
Leasing Nonrecourse Term Loans | Asset-Backed Term Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Principal amount |  | 501.8 |  |  |
Debt instrument amount outstanding |  | $ 475.4 |  |  |
2.875% Convertible senior notes, due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible senior notes |  |  | $ 47.7 | $ 47.7 |
Debt instrument, interest rate |  | 2.875% |  | 2.875% | 2.875%
Debt instrument, maturity date |  | Feb. 01, 2024 |  |  |
GBX Leasing |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt issuance costs, net | $ 2.2 |  |  |  |
GBX Leasing | 2023 GBXL Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Principal amount | $ 178.5 |  |  |  |
Debt instrument, maturity year | 2053 |  |  |  |
Debt instruments additional interest rate per annum | 4.00% |  |  |  |
GBX Leasing | 2023 GBXL Notes | GBXL I Series 2023-1 Class A Secured Railcar Equipment Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Principal amount | $ 158.9 |  |  |  |
Debt instrument, interest rate | 6.42% |  |  |  |
Debt instrument, maturity date | Nov. 20, 2053 |  |  |  |
GBX Leasing | 2023 GBXL Notes | GBXL I Series 2023-1 Class B Secured Railcar Equipment Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Principal amount | $ 19.6 |  |  |  |
Debt instrument, interest rate | 7.28% |  |  |  |
Debt instrument, maturity date | Nov. 20, 2053 |  |  |  |
GBX Leasing | GBXL I Series 2022-1 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Principal amount |  | $ 323.3 |  |  |

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