Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Condensed Consolidated Statements of Comprehensive Income
Net income attributable to AAR and noncontrolling interest	$ 18.5	$ 20.8	$ 54.7	$ 55.0
Other comprehensive income, net of tax:
Currency translation adjustments, net of tax	0.7	5.4	13.0	4.6
Derivative instruments unrealized gain (loss), net of tax expense (benefit) of $0.2 and ($0.3) for the three months ended February 28, 2013 and February 29, 2012, respectively, and $0 and ($1.8) for the nine months ended February 28, 2013 and February 29, 2012, respectively	0.4	(0.6)		(3.3)
Total other comprehensive income, net of tax	1.1	4.8	13.0	1.3
Comprehensive income	19.6	25.6	67.7	56.3
Less: Comprehensive income attributable to noncontrolling interests	(0.1)	(0.2)	(0.3)	(0.2)
Comprehensive income attributable to AAR	$ 19.5	$ 25.4	$ 67.4	$ 56.1