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Earnings Per Share - Approach to Calculate Diluted Earning Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Earnings Per Share [Abstract]
Net earnings attributable to Greenbrier	$ 32,477	$ 48,967	$ 71,076
Weighted average diluted common shares outstanding	33,665	33,441	33,165
Diluted earnings per share	$ 0.96	$ 1.46	$ 2.14

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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