Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		12 Months Ended
		Aug. 31, 2023		Aug. 31, 2022	Aug. 31, 2021
Revenue
Revenue		$ 3,944.0		$ 2,977.7	$ 1,747.9
Cost of revenue
Cost of revenue		3,502.9		2,671.7	1,516.3
Margin		441.1		306.0	231.6
Selling and administrative		235.3		225.2	191.8
Net gain on disposition of equipment		(17.3)		(37.2)	(1.2)
Asset impairment, disposal, and exit costs, net		46.7
Earnings from operations		176.4		118.0	41.0
Other costs
Interest and foreign exchange		85.4		57.4	43.3
Net loss on extinguishment of debt					6.3
Earnings (loss) before income tax and earnings from unconsolidated affiliates		91.0		60.6	(8.6)
Income tax (expense) benefit		(24.6)		(18.1)	40.2
Earnings before earnings from unconsolidated affiliates		66.4		42.5	31.6
Earnings from unconsolidated affiliates		9.2		11.3	3.5
Net earnings		75.6		53.8	35.1
Net earnings attributable to noncontrolling interest		(13.1)		(6.9)	(2.7)
Net earnings attributable to Greenbrier		$ 62.5		$ 46.9	$ 32.4
Basic earnings per common share		$ 1.95		$ 1.44	$ 0.99
Diluted earnings per common share		$ 1.89	[1]	$ 1.40	$ 0.96
Weighted average common shares
Basic	[2]	31,983		32,569	32,648
Diluted		33,799		33,631	33,665
Manufacturing
Revenue
Revenue		$ 3,357.7		$ 2,476.6	$ 1,311.1
Cost of revenue
Cost of revenue		3,083.4		2,300.9	1,189.2
Maintenance Services
Revenue
Revenue		406.4		347.7	298.3
Cost of revenue
Cost of revenue		364.0		322.0	280.4
Leasing & Management Services
Revenue
Revenue		179.9		153.4	138.5
Cost of revenue
Cost of revenue		$ 55.5		$ 48.8	$ 46.7

[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. No participating securities are included in basic common shares outstanding for the year ended August 31, 2023.