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Revolving Notes - Additional Information (Detail)
12 Months Ended
Aug. 27, 2021
Aug. 26, 2021
Aug. 31, 2021
USD ($)
Facility
CreditFacility
Aug. 31, 2020
USD ($)
Line of Credit Facility [Line Items]        
Line of credit facility maximum capacity     $ 187,900,000  
Long-term Line of Credit     $ 372,176,000 $ 351,526,000
Number of lines of credits | CreditFacility     3  
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     $ 1,050,000,000.00  
Letter of credit facility outstanding amount     8,400,000 $ 28,700,000
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 2026-08 2024-06 2026-08  
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     95.00%  
Long-term Line of Credit     $ 147,000,000.0  
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     $ 76,600,000  
Long-term Line of Credit     $ 39,000,000.0  
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | Minimum        
Line of Credit Facility [Line Items]        
Line of credit maturity date     2022-06  
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | Maximum        
Line of Credit Facility [Line Items]        
Line of credit maturity date     2023-10  
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 Joint Venture 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  
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  
Joint venture partner each guaranteed percentage     50.00%  
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  
Line of credit facility borrowings outstanding due period     2023-06  
Joint venture partner each guaranteed percentage     50.00%  
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%