Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2021
Statement of Comprehensive Income [Abstract]
Net earnings		$ 75.6	$ 53.8	$ 35.1
Other comprehensive income (loss)
Translation adjustment		25.3	(21.6)	4.0
Reclassification of derivative financial instruments recognized in net earnings	[1]	(9.1)	4.7	5.0
Unrealized gain (loss) on derivative financial instruments	[2]	23.1	15.7	(0.4)
Other (net of tax effect)		(1.0)	(0.7)	0.5
Other comprehensive income		38.3	(1.9)	9.1
Comprehensive income		113.9	51.9	44.2
Comprehensive income attributable to noncontrolling interest		(13.1)	(6.9)	(2.6)
Comprehensive income attributable to Greenbrier		$ 100.8	$ 45.0	$ 41.6

[1] Net of tax effect of $3.7 million, $(1.7) million and $(1.7) million for the years ended August 31, 2023, 2022 and 2021, respectively.

[2] Net of tax effect of $(8.8) million, $(6.2) million and $1.0 million for the years ended August 31, 2023, 2022 and 2021, respectively.