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Earnings Per Share - Approach to Calculate Diluted Earning Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020
Earnings Per Share [Abstract]
Net earnings attributable to Greenbrier	$ 19,737	$ 27,772	$ 700	$ 49,070
Weighted average diluted common shares outstanding	33,605	33,478	33,747	33,414
Diluted earnings per common share	$ 0.59	$ 0.83	$ 0.02	$ 1.47

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