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Acquisitions - Additional Information (Detail)
€ in Millions
3 Months Ended 12 Months Ended
Jun. 01, 2018
EUR (€)
Jun. 01, 2017
EUR (€)
Aug. 31, 2018
USD ($)
May 31, 2018
USD ($)
Feb. 28, 2018
USD ($)
Nov. 30, 2017
USD ($)
Aug. 31, 2017
USD ($)
May 31, 2017
USD ($)
Feb. 28, 2017
USD ($)
Nov. 30, 2016
USD ($)
Aug. 31, 2018
USD ($)
Aug. 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
Aug. 20, 2018
USD ($)
Aug. 02, 2018
Jun. 01, 2017
USD ($)
Business Acquisition [Line Items]                                
Net assets acquired                           $ 56,800,000    
Revenue     $ 689,206,000 $ 641,387,000 $ 629,336,000 $ 559,535,000 $ 611,407,000 $ 439,161,000 $ 566,282,000 $ 552,314,000 $ 2,519,464,000 [1] $ 2,169,164,000 [1] $ 2,679,524,000 [1]      
Earnings (loss) from operations     $ 59,134,000 $ 71,539,000 $ 60,870,000 $ 61,442,000 $ 57,780,000 $ 48,472,000 $ 81,520,000 $ 72,660,000 $ 252,985,000 $ 260,432,000 $ 408,552,000      
Rayvag                                
Business Acquisition [Line Items]                                
Ownership interest in entity     68.00%               68.00%       68.00%  
Greenbrier-Astra Rail                                
Business Acquisition [Line Items]                                
Net assets acquired                               $ 115,825,000
Ownership percentage by parent             75.00%         75.00%       75.00%
Amount of consideration paid | € € 30 € 30                            
Ownership interest in entity                               25.00%
Noncontrolling interest, fair value of acquisition                               $ 38,300,000
Adjustments to reconcile carrying value of redemption amount to recorded retained earnings                     $ 0          
Revenue                     136,800,000          
Earnings (loss) from operations                     $ 11,500,000          
[1] Revenue is presented on the basis of geographic location of customers.