Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Net income attributable to AAR and noncontrolling interest	$ 17.9	$ 17.6	$ 36.2	$ 34.2
Other comprehensive income, net of tax:
Currency translation adjustments, net of tax	8.0	(0.9)	12.3	(0.8)
Derivative instruments unrealized losses, net of tax (benefit) expense of $0 and ($0.1) for the three months ended November 30, 2012 and 2011, respectively, and ($0.2) and ($1.5) for the six months ended November 30, 2012 and 2011, respectively		(0.2)	(0.4)	(2.7)
Total other comprehensive income, net of tax	8.0	(1.1)	11.9	(3.5)
Comprehensive income	25.9	16.5	48.1	30.7
Less: Comprehensive income attributable to noncontrolling interests	(0.1)		(0.2)
Comprehensive income attributable to AAR	$ 25.8	$ 16.5	$ 47.9	$ 30.7