Condensed Consolidated Statements of Changes in Equity (USD $) In Millions, unless otherwise specified	Total	Total AAR Shareholders' Equity	Common Stock	Capital Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Balance at May. 31, 2012	$ 866.0	$ 864.6	$ 44.8	$ 423.6	$ 541.8	$ (90.4)	$ (55.2)	$ 1.4
Increase (Decrease) in Stockholders' Equity
Net income	18.3	18.2			18.2			0.1
Cash dividends	(3.0)	(3.0)			(3.0)
Exercise of stock options and stock awards	0.8	0.8		0.8
Restricted stock activity	2.2	2.2		(1.0)		3.2
Repurchase of shares	(6.1)	(6.1)				(6.1)
Other comprehensive income, net of tax	3.9	3.9					3.9
Balance at Aug. 31, 2012	$ 882.1	$ 880.6	$ 44.8	$ 423.4	$ 557.0	$ (93.3)	$ (51.3)	$ 1.5