Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Aug. 31, 2015	May 31, 2015	Feb. 28, 2017	Feb. 29, 2016	May 31, 2015	May 31, 2016
Discontinued Operations
Interest expense	$ (1.5)	$ (1.7)			$ (4.0)	$ (5.2)
Operating income from discontinued operations
Operating loss from discontinued operations	(0.1)	(1.3)			(0.7)	(7.3)
Telair Cargo Group and PSM | Discontinued Operations, Held-for-sale or Disposed of by Sale
Discontinued Operations
General corporate overhead	0.0	0.0			0.0	0.0
Interest expense	0.0	0.0			0.0	0.0
Assets and liabilities held for sale related to discontinued operations
Assets of discontinued operations	0.1				0.1			$ 4.0
Liabilities of discontinued operations	7.7				7.7			$ 12.5
Operating income from discontinued operations
Sales		3.5			0.6	8.6
Cost of sales		(3.8)			(1.0)	(13.0)
Selling, general and administrative expenses	(0.1)	(1.0)			(0.3)	(2.9)
Operating loss from discontinued operations	$ (0.1)	$ (1.3)			$ (0.7)	$ (7.3)
Telair Cargo Group | Disposed of by sale
Discontinued Operations
Cash consideration received before fees and expenses				$ 705.0
Gain on sale of assets				198.6
Telair Cargo Group | A400M | Disposed of by sale
Discontinued Operations
Gain recognized on sale of business			$ 27.7
Telair Cargo Group | A400M | Maximum | Disposed of by sale
Discontinued Operations
Contingent consideration				$ 35.0
Precision Systems Manufacturing | Discontinued Operations, Held-for-sale
Discontinued Operations
Recognized impairment charge							$ 57.5