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Revolving Notes - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Aug. 31, 2024
USD ($)
Facility
Aug. 31, 2023
USD ($)
Line of Credit Facility [Line Items]      
Long-term line of credit   $ 351,600,000 $ 297,100,000
Repayments of revolving notes in 2025   42,800,000  
Repayments of revolving notes in 2026   265,500,000  
Repayments of revolving notes in 2027   312,400,000  
European      
Line of Credit Facility [Line Items]      
Aggregate amount available to draw down   31,600,000  
Line of credit, guaranteed amount   33,100,000  
Mexican      
Line of Credit Facility [Line Items]      
Line of credit facility maximum capacity   $ 66,000,000  
Minimum | European      
Line of Credit Facility [Line Items]      
Line of credit maturity date   2024-10  
Minimum | Mexican      
Line of Credit Facility [Line Items]      
Line of credit facility borrowings outstanding due period   2025-02  
Maximum | European      
Line of Credit Facility [Line Items]      
Line of credit maturity date   2026-09  
Maximum | Mexican      
Line of Credit Facility [Line Items]      
Line of credit facility borrowings outstanding due period   2027-01  
WIBOR | Minimum | European      
Line of Credit Facility [Line Items]      
Debt instrument, percentage points added to the reference rate   1.10%  
WIBOR | Maximum | European      
Line of Credit Facility [Line Items]      
Debt instrument, percentage points added to the reference rate   1.45%  
EURIBOR | European      
Line of Credit Facility [Line Items]      
Debt instrument, percentage points added to the reference rate   1.90%  
Senior Secured Credit Facilities      
Line of Credit Facility [Line Items]      
Number of senior secured credit facilities | Facility   4  
Line of credit facility maximum capacity   $ 1,400,000,000  
Letter of credit facility outstanding amount   5,900,000 4,900,000
Senior Secured Credit Facilities | North American      
Line of Credit Facility [Line Items]      
Long-term line of credit   0  
Senior Secured Credit Facilities | European      
Line of Credit Facility [Line Items]      
Long-term line of credit   46,700,000 47,200,000
Senior Secured Credit Facilities | Mexican      
Line of Credit Facility [Line Items]      
Long-term line of credit   110,000,000.0 110,000,000.0
Committed Credit Facilities      
Line of Credit Facility [Line Items]      
Aggregate amount available to draw down   345,900,000  
Committed Credit Facilities | North American      
Line of Credit Facility [Line Items]      
Aggregate amount available to draw down   258,300,000  
Committed Credit Facilities | Mexican      
Line of Credit Facility [Line Items]      
Aggregate amount available to draw down   56,000,000  
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities      
Line of Credit Facility [Line Items]      
Repayments of revolving notes in 2025   154,400,000  
Repayments of revolving notes in 2026   2,300,000  
Repayments of revolving notes in 2027   194,900,000  
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | North American      
Line of Credit Facility [Line Items]      
Line of credit facility maximum capacity   $ 600,000,000  
Line of credit maturity date   2026-08  
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | European      
Line of Credit Facility [Line Items]      
Line of credit facility maximum capacity   $ 78,200,000  
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | Prime Rate | North American      
Line of Credit Facility [Line Items]      
Debt instrument, percentage points added to the reference rate   0.50%  
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | SOFR | North American      
Line of Credit Facility [Line Items]      
Debt instrument, percentage points added to the reference rate   1.50%  
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | SOFR Adjustment | North American      
Line of Credit Facility [Line Items]      
Debt instrument, percentage points added to the reference rate   0.10%  
GBX Leasing      
Line of Credit Facility [Line Items]      
Line of credit facility maximum capacity $ 450,000,000 $ 550,000,000  
Line of credit maturity date 2029-09 2027-08  
Notional covering percentage of outstanding balance   74.00%  
Warehouse Credit Facility Reduces $ (100,000,000)    
Long-term line of credit   $ 194,900,000 $ 139,900,000
GBX Leasing | SOFR      
Line of Credit Facility [Line Items]      
Debt instrument, percentage points added to the reference rate   1.85%  
GBX Leasing | SOFR Adjustment      
Line of Credit Facility [Line Items]      
Debt instrument, percentage points added to the reference rate   0.11%  
Mexican Railcar Manufacturing Joint Venture Line of Credit, 4 Component of Senior Secured Credit Facilities | Mexican      
Line of Credit Facility [Line Items]      
Line of credit facility maximum capacity   $ 166,000,000  
Mexican Railcar Manufacturing Operations Line of Credit 1, 3rd Component of Senior Secured Credit Facilities | LIBOR | Mexican      
Line of Credit Facility [Line Items]      
Debt instrument, percentage points added to the reference rate   4.25%  
Mexican Railcar Manufacturing Operations Line of Credit 2, 3rd Component of Senior Secured Credit Facilities | SOFR | Mexican      
Line of Credit Facility [Line Items]      
Debt instrument, percentage points added to the reference rate   2.22%  
Mexican Railcar Manufacturing Operations Line of Credit 3, 3rd Component of Senior Secured Credit Facilities | Mexican      
Line of Credit Facility [Line Items]      
Joint venture partner each guaranteed percentage   50.00%