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Earnings (Loss) Per Share - Approach to Calculate Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Nov. 30, 2023
Nov. 30, 2022
Earnings Per Share Disclosure [Line Items]    
Net earnings (loss) attributable to Greenbrier $ 31.2 $ (16.7)
Weighted average basic common shares outstanding 31,025 32,719
Basic earnings (loss) per share $ 1.00 $ (0.51)
Net Income (Loss) $ 31.2 $ (16.7)
Interest and debt issuance costs on the 2.875% convertible notes due 2024, net of tax 0.3  
Earnings before interest and debt issuance costs on the 2.875% convertible notes due 2024 $ 31.5  
Weighted average diluted common shares outstanding 32,782 32,719
Diluted earnings (loss) per common share [1] $ 0.96 $ (0.51)
[1] Diluted earnings per share was calculated as follows:

Earnings before interest and debt issuance costs on the 2.875% convertible notes due 2024

Weighted average diluted common shares outstanding