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Revolving Notes - Additional Information (Detail) - USD ($)
 3 Months Ended
Nov. 30, 2024
Aug. 31, 2024
Line of Credit Facility [Line Items]    
Long-term line of credit $ 444,900,000 $ 351,600,000
European    
Line of Credit Facility [Line Items]    
Line of credit, guaranteed amount 31,700,000  
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 2025-06  
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 1.40%  
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]    
Line of credit facility maximum capacity $ 1,300,000,000  
Letter of credit facility outstanding amount 6,600,000 5,900,000
Senior Secured Credit Facilities | North American    
Line of Credit Facility [Line Items]    
Long-term line of credit 120,000,000 0
Senior Secured Credit Facilities | European    
Line of Credit Facility [Line Items]    
Long-term line of credit 56,300,000 46,700,000
Senior Secured Credit Facilities | Mexican    
Line of Credit Facility [Line Items]    
Long-term line of credit 75,000,000 110,000,000
Committed Credit Facilities    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 248,700,000  
Committed Credit Facilities | North American    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 139,500,000  
Committed Credit Facilities | European    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 18,200,000  
Committed Credit Facilities | Mexican    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 91,000,000  
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 $ 74,500,000  
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  
Line of credit maturity date 2029-09  
Long-term line of credit $ 193,600,000 $ 194,900,000
Notional covering percentage of outstanding balance 85.00%  
GBX Leasing | SOFR    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 1.70%  
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%