Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Cash flows used in operating activities:
Net income	$ 10.6	$ 9.5
Loss from discontinued operations		0.4
Income from continuing operations	10.6	9.9
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and intangible amortization	14.6	12.4
Stock-based compensation	2.6	2.5
Amortization of overhaul costs	3.0	4.5
Deferred tax provision (benefit)	0.2	(0.9)
Gain on asset disposal		(2.6)
Changes in certain assets and liabilities:
Accounts receivable	(13.2)	9.7
Inventories	10.8	3.0
Rotable spares and equipment on or available for short-term lease	(0.2)	(0.7)
Equipment supporting long-term programs	(11.8)	(17.3)
Accounts and trade notes payable	(0.7)	(8.4)
Accrued and other liabilities	(29.6)	(5.8)
Other, primarily program and overhaul costs	(6.4)	(6.8)
Net cash used in operating activities - continuing operations	(20.1)	(0.5)
Net cash used in operating activities - discontinued operations	(0.5)	(0.6)
Net cash used in operating activities	(20.6)	(1.1)
Cash flows used in investing activities:
Property, plant and equipment expenditures	(8.2)	(9.4)
Proceeds from asset disposals	1.3	3.0
Investment in aircraft joint ventures		(0.2)
Net cash used in investing activities - continuing operations	(6.9)	(6.6)
Cash flows provided from (used in) financing activities:
Short-term borrowings, net	34.0	7.0
Reduction in long-term borrowings		(5.0)
Cash dividends	(2.6)	(2.6)
Purchase of treasury stock	(5.2)	(14.8)
Stock option exercises	6.5	0.6
Other	(0.4)	(0.4)
Net cash provided from (used in) financing activities - continuing operations	32.3	(15.2)
Effect of exchange rate changes on cash		(0.4)
Increase (Decrease) in cash and cash equivalents	4.8	(23.3)
Cash and cash equivalents, beginning of period	10.3	31.2
Cash and cash equivalents, end of period	$ 15.1	$ 7.9