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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, 2025
Aug. 31, 2024
Aug. 31, 2023
Earnings Per Share Disclosure [Line Items]      
Net Income (Loss) $ 204.1 $ 160.1 $ 62.5
Weighted average basic common shares outstanding 31,171 31,102 31,983
Basic earnings per share $ 6.55 $ 5.15 $ 1.95
Net earnings attributable to Greenbrier $ 204.1 $ 160.1 $ 62.5
Interest and debt issuance costs on the 2.875% convertible notes due 2024, net of tax 0.0 0.5 1.2
Earnings before interest and debt issuance costs on the 2.875% convertible notes due 2024 $ 204.1 $ 160.6 $ 63.7
Weighted average diluted common shares outstanding 32,139 32,363 33,799
Diluted earnings per share [1] $ 6.35 $ 4.96 $ 1.89
[1] Diluted earnings per share for the year ended August 31, 2024 and 2023 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