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Revolving Notes - Additional Information (Detail)
 6 Months Ended
Feb. 28, 2023
USD ($)
CreditFacility
Aug. 31, 2022
USD ($)
Line of Credit Facility [Line Items]    
Long-term line of credit $ 310,300,000 $ 296,600,000
European    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity 71,700,000  
Long-term line of credit $ 35,000,000.0  
Mexican    
Line of Credit Facility [Line Items]    
Number of lines of credits | CreditFacility 3  
Minimum | European    
Line of Credit Facility [Line Items]    
Line of credit maturity date 2023-06  
Maximum | European    
Line of Credit Facility [Line Items]    
Line of credit maturity date 2024-09  
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 | Minimum | European    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 1.10%  
EURIBOR | Maximum | European    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 1.50%  
Senior Secured Credit Facilities    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 1,100,000,000  
Letter of credit facility outstanding amount 5,500,000 6,900,000
Senior Secured Credit Facilities | North American    
Line of Credit Facility [Line Items]    
Long-term line of credit 125,000,000.0 160,000,000.0
Senior Secured Credit Facilities | European    
Line of Credit Facility [Line Items]    
Long-term line of credit 34,800,000 51,600,000
Senior Secured Credit Facilities | Mexican    
Line of Credit Facility [Line Items]    
Long-term line of credit 85,000,000.0 $ 85,000,000.0
Committed Credit Facilities    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 436,000,000.0  
Committed Credit Facilities | North American    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 364,100,000  
Committed Credit Facilities | European    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 36,900,000  
Committed Credit Facilities | Mexican    
Line of Credit Facility [Line Items]    
Aggregate amount available to draw down 35,000,000.0  
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 $ 600,000,000.0  
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 0.75%  
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 1.75%  
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 $ 350,000,000.0  
Line of credit maturity date 2027-08  
Long-term line of credit $ 65,500,000  
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 Operations Line of Credit, 3rd Component of Senior Secured Credit Facilities | Mexican    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 120,000,000.0  
Mexican Railcar Manufacturing Operations Line of Credit 1, 3rd Component of Senior Secured Credit Facilities | Mexican    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 50,000,000.0  
Line of credit facility borrowings outstanding due period 2024-10  
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 | Mexican    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 40,000,000.0  
Joint venture partner each guaranteed percentage 50.00%  
Line of credit facility borrowings outstanding due period 2025-02  
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 2.55%  
Mexican Railcar Manufacturing Operations Line of Credit 3, 3rd Component of Senior Secured Credit Facilities | Mexican    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 30,000,000.0  
Joint venture partner each guaranteed percentage 50.00%  
Line of credit facility borrowings outstanding due period 2024-06  
Mexican Railcar Manufacturing Operations Line of Credit 3, 3rd Component of Senior Secured Credit Facilities | LIBOR | Minimum | Mexican    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 3.75%  
Mexican Railcar Manufacturing Operations Line of Credit 3, 3rd Component of Senior Secured Credit Facilities | LIBOR | Maximum | Mexican    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 4.25%