Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		3 Months Ended				6 Months Ended
		Feb. 28, 2023		Feb. 28, 2022		Feb. 28, 2023	Feb. 28, 2022
Revenue
Revenue		$ 1,122.0		$ 682.8		$ 1,888.5	$ 1,233.5
Cost of revenue
Cost of revenue		1,005.2		628.0		1,702.2	1,131.1
Margin		116.8		54.8		186.3	102.4
Selling and administrative expense		59.0		54.7		112.4	99.0
Net gain on disposition of equipment		(9.6)		(25.1)		(12.9)	(33.6)
Impairment of long-lived assets						24.2
Earnings from operations		67.4		25.2		62.6	37.0
Other costs
Interest and foreign exchange		21.6		11.8		41.2	24.4
Earnings before income tax and earnings from unconsolidated affiliates		45.8		13.4		21.4	12.6
Income tax expense		(11.9)		(3.2)		(8.1)	(1.8)
Earnings before earnings from unconsolidated affiliates		33.9		10.2		13.3	10.8
Earnings from unconsolidated affiliates		2.9		1.0		6.2	6.0
Net earnings		36.8		11.2		19.5	16.8
Net (earnings) loss attributable to noncontrolling interest		(3.7)		1.6		(3.1)	6.8
Net earnings attributable to Greenbrier		$ 33.1		$ 12.8		$ 16.4	$ 23.6
Basic earnings per common share		$ 1.01		$ 0.39		$ 0.50	$ 0.72
Diluted earnings per common share		$ 0.97	[1]	$ 0.38	[1]	$ 0.49	$ 0.70
Weighted average common shares:
Basic	[2]	32,588		32,582		32,654	32,546
Diluted		34,400		34,463		33,654	33,609
Manufacturing
Revenue
Revenue		$ 968.6		$ 555.7		$ 1,615.1	$ 1,008.2
Cost of revenue
Cost of revenue		901.2		535.0		1,505.7	956.6
Maintenance Services
Revenue
Revenue		98.0		86.6		183.5	159.0
Cost of revenue
Cost of revenue		89.6		81.7		169.2	152.9
Leasing & Management Services
Revenue
Revenue		55.4		40.5		89.9	66.3
Cost of revenue
Cost of revenue		$ 14.4		$ 11.3		$ 27.3	$ 21.6

[1] Diluted earnings per share 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

[2] 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.