Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Statement of Comprehensive Income [Abstract]
Net earnings		$ 53.8	$ 35.1	$ 87.6
Other comprehensive income (loss)
Translation adjustment		(21.6)	4.0	(5.6)
Reclassification of derivative financial instruments recognized in net earnings	[1]	4.7	5.0	4.2
Unrealized gain (loss) on derivative financial instruments	[2]	15.7	(0.4)	(7.3)
Other (net of tax effect)		(0.7)	0.5	0.7
Other comprehensive income		(1.9)	9.1	(8.0)
Comprehensive income		51.9	44.2	79.6
Comprehensive income attributable to noncontrolling interest		(6.9)	(2.6)	(38.6)
Comprehensive income attributable to Greenbrier		$ 45.0	$ 41.6	$ 41.0

[1] Net of tax effect of ($1.7 million), ($1.7 million) and ($1.5 million) for the years ended August 31, 2022, 2021 and 2020, respectively

[2] Net of tax effect of ($6.2 million), $1.0 million and $2.9 million for the years ended August 31, 2022, 2021 and 2020, respectively