Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Cash flows from operating activities:
Net income attributable to AAR and noncontrolling interest	$ 56.0	$ 54.7
Adjustments to reconcile net income attributable to AAR and noncontrolling interest to net cash provided from operating activities:
Depreciation and amortization	59.2	60.4
Amortization of stock-based compensation	6.3	8.0
Amortization of debt discount	4.6	8.1
Amortization of overhaul costs	26.1	20.6
Deferred tax provision	4.7	23.0
Earnings from joint ventures	(2.6)	(5.8)
Changes in certain assets and liabilities:
Accounts and notes receivable	(10.1)	1.5
Inventories	(37.0)	(21.5)
Rotable spares and equipment on or available for short-term lease	6.0	5.0
Equipment on long-term lease	(10.1)	0.8
Accounts payable	9.6	(24.1)
Accrued and other liabilities	(18.3)	11.1
Other, primarily program and overhaul costs	(17.7)	(54.0)
Net cash provided from operating activities	76.7	87.8
Cash flows from investing activities:
Property, plant and equipment expenditures	(21.2)	(23.9)
Proceeds from sale of equipment	1.4	11.8
Payments for acquisitions	(16.1)	(16.5)
Proceeds from aircraft joint ventures		15.4
Other	(0.6)	(0.7)
Net cash used in investing activities	(36.5)	(13.9)
Cash flows from financing activities:
Short-term borrowings, net	20.0	25.0
Proceeds from borrowings		7.3
Reduction in borrowings	(18.0)	(109.3)
Reduction in equity due to convertible bond repurchases		(0.5)
Cash dividends	(8.9)	(9.9)
Purchase of treasury stock	(1.0)	(8.4)
Stock option exercises	5.2	0.8
Tax benefits from exercise of stock options	1.0	0.1
Other	(0.3)	(0.6)
Net cash used in financing activities	(2.0)	(95.5)
Effect of exchange rate changes on cash	1.2	1.3
Increase (decrease) in cash and cash equivalents	39.4	(20.3)
Cash and cash equivalents, beginning of period	75.3	67.7
Cash and cash equivalents, end of period	$ 114.7	$ 47.4