Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Condensed Consolidated Statements of Comprehensive Income
Net income attributable to AAR and noncontrolling interest	$ 18.0	$ 18.3
Other comprehensive income (loss), net of tax:
Currency translation adjustments, net of tax of $0.2 and $0	2.8	4.3
Unrealized gain (loss) on derivative instruments
Unrealized gain (loss) arising during period, net of tax of $0.4 and $0.2	0.9	(0.4)
Pension and other post-retirement plans:
Amortization of actuarial loss and prior service cost included in net income, net of tax of $0.2 and $0	0.2
Other comprehensive income, net of tax	21.9	22.2
Comprehensive income related to noncontrolling interest	(0.1)	(0.1)
Comprehensive income attributable to AAR	$ 21.8	$ 22.1