Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Sales:
Sales from products	$ 289.7	$ 363.9	$ 909.0	$ 1,014.6
Sales from services	230.5	170.3	674.5	487.1
Total sales	520.2	534.2	1,583.5	1,501.7
Cost and operating expenses:
Cost of products	262.3	309.9	801.8	881.3
Cost of services	181.7	137.4	527.8	379.2
Selling, general and administrative	41.8	51.2	145.9	138.9
Total costs and operating expenses	485.8	498.5	1,475.5	1,399.4
Earnings from joint ventures	3.2	0.1	5.8	0.6
Operating income	37.6	35.8	113.8	102.9
Loss on extinguishment of debt			(0.3)
Interest expense	(10.2)	(10.7)	(31.6)	(26.0)
Interest income	0.4	0.5	1.1	0.9
Income before provision for income taxes	27.8	25.6	83.0	77.8
Provision for income taxes	9.3	4.8	28.3	22.8
Net income attributable to AAR and noncontrolling interest	18.5	20.8	54.7	55.0
Income attributable to noncontrolling interest	0.1	0.2	0.3	0.2
Net income attributable to AAR	$ 18.4	$ 20.6	$ 54.4	$ 54.8
Earnings per share - basic (in dollars per share)	$ 0.47	$ 0.51	$ 1.37	$ 1.36
Earnings per share - diluted (in dollars per share)	$ 0.46	$ 0.50	$ 1.35	$ 1.33