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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Related Party Transaction [Line Items]      
Carrying amount of investment in unconsolidated affiliates $ 0.7 $ 3.2  
Percentage of recognized revenue and margin from sale 60.00%    
Percentage of deferred revenue and margin from sale 40.00%    
Revenue recognized associated with railcars sold     $ 4.7
Related party expenses $ 0.9 0.2 0.3
Dividends paid to joint venture partner $ 16.9 25.3 38.9
Axis LLC      
Related Party Transaction [Line Items]      
Percentage of ownership in entity 41.90%    
Greenbrier      
Related Party Transaction [Line Items]      
Percentage of ownership in entity 40.00%    
Amsted-Maxion Cruzeiro      
Related Party Transaction [Line Items]      
Percentage of ownership in entity 29.50%    
Note receivable     4.5
Greenbrier-Maxion      
Related Party Transaction [Line Items]      
Percentage of ownership in entity 60.00%    
Note receivable     3.8
Leasing Warehouse      
Related Party Transaction [Line Items]      
Revenue recognized associated with railcars sold $ 9.3    
Railcar Components | Axis LLC      
Related Party Transaction [Line Items]      
Purchases of goods from related party $ 11.5 $ 13.5 12.7
Joint Venture Agreement      
Related Party Transaction [Line Items]      
Dividends paid to joint venture partner     $ 22.5