v3.26.3
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, 2026
Aug. 31, 2025
Aug. 31, 2024
Earnings Per Share Disclosure [Line Items]      
Net Income (Loss) $ 79.0 $ 204.1 $ 160.1
Weighted average basic common shares outstanding 30,937 31,171 31,102
Basic earnings per common share $ 2.55 $ 6.55 $ 5.15
Net earnings attributable to Greenbrier $ 79.0 $ 204.1 $ 160.1
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     $ 160.6
Weighted average diluted common shares outstanding 31,772 32,139 32,363
Diluted earnings per common share [1] $ 2.49 $ 6.35 $ 4.96
[1] Diluted EPS for the year ended August 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