Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2014	Aug. 31, 2013
Condensed Consolidated Statements of Comprehensive Income
Net income attributable to AAR and noncontrolling interest	$ 14.5	$ 18.0
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments, net of tax of ($0.4) and $0.2	(9.0)	2.8
Unrealized gain on derivative instruments:
Unrealized gain arising during period, net of tax of $0.2 and $0.4	0.3	0.9
Pension and other post-retirement plans:
Amortization of actuarial loss and prior service cost included in net income, net of tax of $0.1 and $0.2	0.1	0.2
Other comprehensive (loss) income, net of tax	(8.6)	3.9
Comprehensive income, net of tax	5.9	21.9
Comprehensive income related to noncontrolling interest	(0.1)	(0.1)
Comprehensive income attributable to AAR	$ 5.8	$ 21.8