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Earnings (Loss) Per Share - Approach to Calculate Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Nov. 30, 2022
Nov. 30, 2021
Earnings Per Share Disclosure [Line Items]    
Net earnings (loss) attributable to Greenbrier $ (16.7) $ 10.8
Weighted average basic common shares outstanding [1] 32,719 32,510
Basic earnings (loss) per common share $ (0.51) $ 0.33
Net earnings (loss) attributable to Greenbrier $ (16.7) $ 10.8
Weighted average diluted common shares outstanding 32,719 33,570
Diluted earnings (loss) per common share $ (0.51) $ 0.32
[1] Restricted stock grants and restricted stock units that are considered participating securities, including some grants subject to certain performance criteria, are included in weighted average basic common shares outstanding when the Company is in a net earnings position.