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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2019
May 31, 2020
May 31, 2020
May 31, 2019
Aug. 31, 2019
Jun. 30, 2017
Related Party Transaction [Line Items]            
Carrying amount of investment in unconsolidated affiliates   $ 4,700 $ 4,700      
Percentage of recognized revenue and margin from sale     60.00%      
Percentage of deferred revenue and margin from sale     40.00%      
Revenue recognize from railcars sold       $ 18,200    
Dividends paid to joint venture partner   22,500 $ 36,152 11,715    
Amsted-Maxion Cruzeiro            
Related Party Transaction [Line Items]            
Percentage of ownership in entity 29.50%       24.50%  
Notes receivable conversion to equity $ 4,800          
Proceeds from notes receivable $ 1,500          
Additional equity method investment ownership percentage 5.00%          
Note receivable   4,500 4,500      
Greenbrier-Maxion            
Related Party Transaction [Line Items]            
Note receivable   3,900 3,900      
Leasing Warehouse            
Related Party Transaction [Line Items]            
Revenue recognize from railcars sold       $ 5,600    
Greenbrier            
Related Party Transaction [Line Items]            
Percentage of ownership in entity           40.00%
Greenbrier | Leasing Warehouse            
Related Party Transaction [Line Items]            
Revenue recognize from railcars sold   $ 0 $ 0      
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   $ 4,300 $ 11,500