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Earnings Per Share - Approach to Calculate Diluted Earning Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		12 Months Ended
		Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Earnings Per Share [Abstract]
Net earnings attributable to Greenbrier		$ 46.9	$ 32.4	$ 49.0
Weighted average basic common shares outstanding	[1]	32,569	32,648	32,670
Basic earnings per share		$ 1.44	$ 0.99	$ 1.50
Net earnings attributable to Greenbrier		$ 46.9	$ 32.4	$ 49.0
Weighted average diluted common shares outstanding		33,631	33,665	33,441
Diluted earnings per share		$ 1.40	$ 0.96	$ 1.46
[1] Restricted stock grants and restricted stock units that are considered participating securities, including some grants subject to certain performance criteria, are included in weighted average basic common shares outstanding when the Company is in a net earnings position.

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-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126958026&loc=d3e1448-109256

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