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Earnings Per Share - Approach to Calculate Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Nov. 30, 2024
Nov. 30, 2023
Earnings Per Share Disclosure [Line Items]    
Net Income (Loss) $ 55.3 $ 31.2
Weighted average basic common shares outstanding 31,246 31,025
Basic earnings per share $ 1.77 $ 1
Net earnings attributable to Greenbrier $ 55.3 $ 31.2
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 $ 55.3 $ 31.5
Weighted average diluted common shares outstanding 32,223 32,782
Diluted earnings per share [1] $ 1.72 $ 0.96
[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