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Notes Payable, Net - Additional Information (Detail) - USD ($) $ in Millions	Nov. 20, 2023	Nov. 30, 2023	Aug. 31, 2023
Debt Instrument [Line Items]
Debt instrument amount outstanding		$ 1,498.9	$ 1,329.9
Debt issuance costs, net		7.1	$ 6.3
Leasing Nonrecourse Term Loans | Nonrecourse Senior Term Debt
Debt Instrument [Line Items]
Debt, Principal amount		343.0
Debt instrument amount outstanding		329.7
Leasing Nonrecourse Term Loans | Asset-Backed Term Notes
Debt Instrument [Line Items]
Debt, Principal amount		501.8
Debt instrument amount outstanding		483.3
GBX Leasing
Debt Instrument [Line Items]
Debt issuance costs, net	$ 2.2
GBX Leasing | GBXL I Series 2023-1 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 | GBXL I Series 2023-1 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 | GBXL I Series 2023-1 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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