Condensed Consolidated Statements of Changes in Equity (USD $) In Millions, unless otherwise specified	Total	Total AAR Stockholders' Equity	Common Stock	Capital Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Balance at May. 31, 2013	$ 919.5	$ 918.6	$ 44.7	$ 431.6	$ 584.9	$ (100.1)	$ (42.5)	$ 0.9
Increase (Decrease) in Stockholders' Equity
Net income	18.0	17.9			17.9			0.1
Cash dividends	(3.0)	(3.0)			(3.0)
Stock option activity	4.8	4.8		(0.3)		5.1
Restricted stock activity	(3.9)	(3.9)		(2.0)		(1.9)
Other comprehensive income, net of tax	3.9	3.9					3.9
Balance at Aug. 31, 2013	$ 939.4	$ 938.3	$ 44.7	$ 429.3	$ 599.8	$ (96.9)	$ (38.6)	$ 1.1