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Revolving Notes - Additional Information (Detail)
 9 Months Ended 12 Months Ended
May 31, 2021
USD ($)
Facility
CreditFacility
Aug. 31, 2020
USD ($)
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 221,300,000  
Long-term Line of Credit $ 325,150,000 $ 351,526,000
Number of lines of credits | CreditFacility 3  
Joint venture partner each guaranteed percentage 50.00%  
Senior Secured Credit Facilities, Consisting of 4 Components    
Line of Credit Facility [Line Items]    
Number of senior secured credit facilities | Facility 4  
Line of credit facility maximum capacity $ 1,040,000,000.00  
Letter of credit facility outstanding amount 25,200,000 28,700,000
Borrowings 160,000,000.0 275,000,000.0
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 600,000,000.0  
Line of credit maturity date 2024-06  
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | LIBOR    
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 | Prime Rate    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 0.50%  
GBX Leasing Warehouse Facility    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 300,000,000.0  
Line of credit maturity date 2025-04  
Percentage of ownership in join venture 90.00%  
Letter of credit facility outstanding borrowings $ 96,600,000  
GBX Leasing Warehouse Facility | LIBOR    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 2.00%  
European Line of Credit, 2nd Component of Senior Secured Credit Facilities    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 71,400,000  
Long-term Line of Credit 36,600,000  
Letter of credit facility outstanding amount $ 38,600,000 46,500,000
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | Minimum    
Line of Credit Facility [Line Items]    
Line of credit maturity date 2021-08  
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | Maximum    
Line of Credit Facility [Line Items]    
Line of credit maturity date 2022-09  
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | WIBOR | Minimum    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 1.20%  
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | WIBOR | Maximum    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 1.50%  
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | EURIBOR    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 1.10%  
Mexican Railcar Manufacturing Operations Line of Credit, 3rd Component of Senior Secured Credit Facilities    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 70,000,000.0  
Letter of credit facility outstanding amount 30,000,000.0 $ 30,000,000.0
Mexican Railcar Manufacturing Operations Line of Credit 1, 3rd Component of Senior Secured Credit Facilities    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 30,000,000.0  
Line of credit facility borrowings outstanding due period 2024-06  
Mexican Railcar Manufacturing Operations Line of Credit 1, 3rd Component of Senior Secured Credit Facilities | LIBOR | Minimum    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 3.75%  
Mexican Railcar Manufacturing Operations Line of Credit 1, 3rd Component of Senior Secured Credit Facilities | LIBOR | Maximum    
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    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 35,000,000.0  
Joint venture partner each guaranteed percentage 50.00%  
Line of credit facility borrowings outstanding due period 2023-06  
Mexican Railcar Manufacturing Operations Line of Credit 2, 3rd Component of Senior Secured Credit Facilities | LIBOR    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 3.70%  
Mexican Railcar Manufacturing Operations Line of Credit 3, 3rd Component of Senior Secured Credit Facilities    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 5,000,000.0  
Line of credit facility borrowings outstanding due period 2022-09  
Mexican Railcar Manufacturing Operations Line of Credit 3, 3rd Component of Senior Secured Credit Facilities | LIBOR    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 2.95%