Condensed Consolidated Statements of Changes in Equity (USD $) In Millions, unless otherwise specified	Common Stock	Capital Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total AAR Stockholders' Equity	Noncontrolling Interest	Total
Balance at May. 31, 2014	$ 44.7	$ 436.4	$ 646.0	$ (98.3)	$ (29.3)	$ 999.5	$ 1.2	$ 1,000.7
Increase (Decrease) in Stockholders' Equity
Net income(loss)			(4.9)			(4.9)	0.2	(4.7)
Cash dividends			(8.9)			(8.9)	(0.5)	(9.4)
Stock option activity		2.0		0.9		2.9		2.9
Restricted stock activity	0.3	3.9		(0.7)		3.5		3.5
Equity portion of bond repurchase		(0.1)				(0.1)		(0.1)
Repurchase of shares				(1.7)		(1.7)		(1.7)
Other comprehensive loss, net of tax					(49.4)	(49.4)		(49.4)
Balance at Feb. 28, 2015	$ 45.0	$ 442.2	$ 632.2	$ (99.8)	$ (78.7)	$ 940.9	$ 0.9	$ 941.8