CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 56.5	$ 47.7	$ 10.4
Other comprehensive income, net of tax:
Currency translation adjustments, net of tax	(0.6)		(7.8)
Derivative instruments, net of tax expense of $1.4 in 2015			2.6
Unrecognized pension and post retirement costs, net of tax expense (benefit) of $2.8 in 2017, ($2.1) in 2016, and ($3.2) in 2015	5.1	(4.0)	(5.9)
Total other comprehensive income (loss), net of tax	4.5	(4.0)	(11.1)
Comprehensive income (loss)	61.0	43.7	(0.7)
Less: Comprehensive income attributable to noncontrolling interest			(0.2)
Comprehensive income (loss) attributable to AAR	$ 61.0	$ 43.7	$ (0.9)