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Revolving Notes - Additional Information (Detail) - USD ($)
 3 Months Ended
Nov. 30, 2023
Aug. 31, 2023
Line of Credit Facility [Line Items]    
Long-term line of credit $ 279,400,000 $ 297,100,000
Notional covering percentage of outstanding balance 99.00%  
European    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 63,700,000  
Line of credit, guaranteed amount 21,900,000  
Mexican    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 85,000,000  
Minimum | European    
Line of Credit Facility [Line Items]    
Line of credit maturity date 2024-06  
Minimum | Mexican    
Line of Credit Facility [Line Items]    
Line of credit facility borrowings outstanding due period 2024-06  
Maximum | European    
Line of Credit Facility [Line Items]    
Line of credit maturity date 2025-11  
Maximum | Mexican    
Line of Credit Facility [Line Items]    
Line of credit maturity date 2026-10  
WIBOR | Minimum | European    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 1.20%  
WIBOR | Maximum | European    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 1.60%  
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 $ 1,400,000,000  
Letter of credit facility outstanding amount 6,400,000 4,900,000
Senior Secured Credit Facilities | North American    
Line of Credit Facility [Line Items]    
Long-term line of credit 40,000,000  
Senior Secured Credit Facilities | European    
Line of Credit Facility [Line Items]    
Long-term line of credit 44,300,000 47,200,000
Senior Secured Credit Facilities | Mexican    
Line of Credit Facility [Line Items]    
Long-term line of credit 130,000,000 110,000,000
Committed Credit Facilities    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 355,200,000  
Committed Credit Facilities | North American    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 280,800,000  
Committed Credit Facilities | European    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 19,400,000  
Committed Credit Facilities | Mexican    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 55,000,000  
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 | 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 $ 550,000,000  
Line of credit maturity date 2027-08  
Long-term line of credit $ 65,100,000 $ 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 $ 185,000,000  
Mexican Railcar Manufacturing Operations Line of Credit 1, 4 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, 4 Component of Senior Secured Credit Facilities | SOFR | Mexican    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 2.55%  
Mexican Railcar Manufacturing Operations Line of Credit 3, 4 Component of Senior Secured Credit Facilities | Mexican    
Line of Credit Facility [Line Items]    
Joint venture partner each guaranteed percentage 50.00%