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Revolving Notes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Line of Credit Facility [Line Items]    
Repayments of revolving notes in 2025 $ 183.3  
Repayments of revolving notes in 2026 334.6  
Repayments of revolving notes in 2027 401.3  
European    
Line of Credit Facility [Line Items]    
Line of credit, guaranteed amount 35.1  
Mexican    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity $ 56.0  
Minimum | European    
Line of Credit Facility [Line Items]    
Line of credit maturity date 2025-10  
Minimum | Mexican    
Line of Credit Facility [Line Items]    
Line of credit maturity date 2026-06  
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 maturity date 2027-03  
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%  
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 $ 600.0  
Aggregate amount available to draw down 389.5  
Letter of credit facility outstanding amount 5.4 $ 5.9
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | European    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity 98.3  
Aggregate amount available to draw down 20.7  
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | Mexican    
Line of Credit Facility [Line Items]    
Line of credit facility maximum capacity 156.0  
Aggregate amount available to draw down $ 86.0  
Joint venture partner each guaranteed percentage 50.00%  
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | Minimum | North American    
Line of Credit Facility [Line Items]    
Line of credit maturity date 2026-08  
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | Maximum | North American    
Line of Credit Facility [Line Items]    
Line of credit maturity date 2030-05  
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 Adjustment | North American    
Line of Credit Facility [Line Items]    
Debt instrument, percentage points added to the reference rate 0.10%  
Mexican Railcar Manufacturing Operations Line of Credit 1, 3rd Component of Senior Secured Credit Facilities | 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]    
Debt instrument, percentage points added to the reference rate 1.96%