Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Net income attributable to AAR and noncontrolling interest	$ 18.3	$ 16.6
Other comprehensive income, net of tax:
Currency translation adjustments, net of tax expense of $0.6 and $0, respectively	4.3	0.1
Derivative instruments unrealized losses, net of tax benefit of ($0.2) and ($1.4), respectively	(0.4)	(2.5)
Total other comprehensive income, net of tax	3.9	(2.4)
Comprehensive income	22.2	14.2
Less: Comprehensive income attributable to noncontrolling interests	(0.1)
Comprehensive income attributable to AAR	$ 22.1	$ 14.2