Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions		3 Months Ended
		Nov. 30, 2022	Nov. 30, 2021
Statement of Comprehensive Income [Abstract]
Net earnings (loss)		$ (17.3)	$ 5.6
Other comprehensive income (loss)
Translation adjustment		5.5	(13.9)
Reclassification of derivative financial instruments recognized in net earnings (loss)	[1]	(0.5)	1.0
Unrealized gain (loss) on derivative financial instruments	[2]	8.9	(3.2)
Other (net of tax effect)			(0.1)
Other comprehensive income		13.9	(16.2)
Comprehensive loss		(3.4)	(10.6)
Comprehensive loss attributable to noncontrolling interest		0.6	5.2
Comprehensive loss attributable to Greenbrier		$ (2.8)	$ (5.4)

[1] 1 Net of tax effect of $0.3 million and ($0.5 million) for the three months ended November 30, 2022 and 2021.

[2] 2 Net of tax effect of ($3.0 million) and $1.0 million for the three months ended November 30, 2022 and 2021.