CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income attributable to AAR and noncontrolling interest	$ 73.2	$ 55.5	$ 68.0
Other comprehensive income, net of tax:
Currency translation adjustments, net of tax	14.0	8.7	(18.5)
Derivative instruments unrealized gain (loss), net of tax expense (benefit) of $0.4 in 2014, $0.3 in 2013, and ($2.1) in 2012	0.7	0.6	(3.9)
Unrecognized pension and post retirement costs, net of tax expense (benefit) of ($0.8) in 2014, $1.8 in 2013, and ($7.6) in 2012	(1.5)	3.4	(14.2)
Total other comprehensive income, net of tax	13.2	12.7	(36.6)
Comprehensive income	86.4	68.2	31.4
Less: Comprehensive income attributable to noncontrolling interests	(0.3)	(0.5)	(0.3)
Comprehensive income attributable to AAR	$ 86.1	$ 67.7	$ 31.1