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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		6 Months Ended
		Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2025	Feb. 29, 2024
Earnings Per Share Disclosure [Line Items]
Net Income (Loss)		$ 51.9	$ 33.4	$ 107.2	$ 64.6
Weighted average basic common shares outstanding		31,376	31,117	31,311	31,071
Basic earnings per share		$ 1.66	$ 1.08	$ 3.42	$ 2.08
Net earnings attributable to Greenbrier		$ 51.9	$ 33.4	$ 107.2	$ 64.6
Interest and debt issuance costs on the 2.875% convertible notes due 2024, net of tax			0.2		0.5
Earnings before interest and debt issuance costs on the 2.875% convertible notes due 2024			$ 33.6		$ 65.1
Weighted average diluted common shares outstanding		33,228	32,570	32,745	32,676
Diluted earnings per share	[1]	$ 1.56	$ 1.03	$ 3.28	$ 1.99
[1] Diluted earnings per share for the three and six months ended February 29, 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

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