Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Statement of Comprehensive Income [Abstract]
Net earnings (loss)		$ 11.2	$ (13.9)	$ 16.8	$ (20.6)
Other comprehensive income (loss)
Translation adjustment		4.3	0.6	(9.6)	4.5
Reclassification of derivative financial instruments recognized in net earnings (loss)	[1]	1.3	1.3	2.3	2.5
Unrealized gain (loss) on derivative financial instruments	[2]	0.8	(0.1)	(2.4)	(0.9)
Other (net of tax effect)		0.2		0.1
Other comprehensive income		6.6	1.8	(9.6)	6.1
Comprehensive income (loss)		17.8	(12.1)	7.2	(14.5)
Comprehensive loss attributable to noncontrolling interest		1.6	4.8	6.8	1.5
Comprehensive income (loss) attributable to Greenbrier		$ 19.4	$ (7.3)	$ 14.0	$ (13.0)

[1] 1 Net of tax effect of $(0.2 million) and $(0.4 million) for the three months ended February 28, 2022 and February 28, 2021 and $(0.7 million) and $(0.8 million) for the six months ended February 28, 2022 and February 28, 2021.

[2] 2 Net of tax effect of ($0.8 million) and ($0.1 million) for the three months ended February 28, 2022 and February 28, 2021 and $0.2 million and ($0.1 million) for the six months ended February 28, 2022 and February 28, 2021.