Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012
Cash flows from operating activities:
Net income attributable to AAR and noncontrolling interest	$ 38.0	$ 36.2
Adjustments to reconcile net income attributable to AAR and noncontrolling interest to net cash provided from operating activities:
Depreciation and amortization	39.2	40.6
Amortization of stock-based compensation	4.0	4.8
Amortization of debt discount	3.0	5.7
Amortization of overhaul costs	17.5	12.7
Deferred tax provision	9.1	9.7
Earnings from joint ventures	(2.0)	(2.6)
Changes in certain assets and liabilities:
Accounts and notes receivable	(20.8)	19.2
Inventories	(4.5)	(20.8)
Rotable spares and equipment on or available for short-term lease	7.3	5.1
Equipment on long-term lease	(1.5)	1.3
Accounts payable	(5.9)	(28.9)
Accrued and other liabilities	(15.6)	2.2
Other, primarily program and overhaul costs	(1.5)	(24.9)
Net cash provided from operating activities	66.3	60.3
Cash flows from investing activities:
Property, plant and equipment expenditures	(14.3)	(19.1)
Proceeds from sale of equipment	1.4	11.5
Payments for acquisitions		(16.5)
Other	(0.6)	(0.7)
Net cash used in investing activities	(13.5)	(24.8)
Cash flows from financing activities:
Proceeds from borrowings		20.0
Reduction in borrowings	(30.4)	(39.3)
Reduction in equity due to convertible bond repurchases		(0.5)
Cash dividends	(6.0)	(7.1)
Purchase of treasury stock		(8.5)
Stock option exercises	5.2
Tax benefits from exercise of stock options	1.0
Other	(0.1)	0.1
Net cash used in financing activities	(30.3)	(35.3)
Effect of exchange rate changes on cash	0.7	1.3
Increase in cash and cash equivalents	23.2	1.5
Cash and cash equivalents, beginning of period	75.3	67.7
Cash and cash equivalents, end of period	$ 98.5	$ 69.2