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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 31, 2023
May 31, 2022
May 31, 2023
May 31, 2022
Related Party Transaction [Line Items]        
Percentage of recognized revenue and margin from sale     60.00%  
Percentage of deferred revenue and margin from sale     40.00%  
Leasing Warehouse        
Related Party Transaction [Line Items]        
Revenue recognize from railcars sold $ 15.1   $ 15.1  
Axis LLC        
Related Party Transaction [Line Items]        
Percentage of ownership in entity 41.90%   41.90%  
Axis LLC | Railcar Components        
Related Party Transaction [Line Items]        
Purchases of goods from related party $ 2.2 $ 3.5 $ 6.7 $ 9.7
Greenbrier        
Related Party Transaction [Line Items]        
Percentage of ownership in entity 40.00%   40.00%