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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 9 Months Ended
May 31, 2025
May 31, 2024
May 31, 2025
May 31, 2024
Earnings Per Share Disclosure [Line Items]        
Net Income (Loss) $ 60.1 $ 33.9 $ 167.3 $ 98.5
Weighted average basic common shares outstanding 31,186 31,131 31,269 31,091
Basic earnings per share $ 1.92 $ 1.09 $ 5.35 $ 3.17
Net earnings attributable to Greenbrier $ 60.1 $ 33.9 $ 167.3 $ 98.5
Interest and debt issuance costs on the 2.875% convertible notes due 2024, net of tax       0.5
Earnings before interest and debt issuance costs on the 2.875% convertible notes due 2024       $ 99.0
Weighted average diluted common shares outstanding 32,184 32,021 32,272 32,456
Diluted earnings per share [1] $ 1.86 $ 1.06 $ 5.18 $ 3.05
[1] Diluted earnings per share for the nine months ended May 31, 2024 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