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Earnings Per Share - Approach to Calculate Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Aug. 31, 2022
Earnings Per Share Disclosure [Line Items]      
Net Income (Loss) $ 160.1 $ 62.5 $ 46.9
Weighted average basic common shares outstanding 31,102 31,983 32,569
Basic earnings per share $ 5.15 $ 1.95 $ 1.44
Net earnings attributable to Greenbrier $ 160.1 $ 62.5 $ 46.9
Interest and debt issuance costs on the 2.875% convertible notes due 2024, net of tax 0.5 1.2  
Earnings before interest and debt issuance costs on the 2.875% convertible notes due 2024 $ 160.6 $ 63.7  
Weighted average diluted common shares outstanding 32,363 33,799 33,631
Diluted earnings per share [1] $ 4.96 $ 1.89 $ 1.4
[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