Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Aug. 31, 2015	May. 31, 2015	Aug. 31, 2014	May. 31, 2015
Discontinued Operations
Interest Expense	$ 2.0		$ 6.4
Operating income from discontinued operations
Operating income (loss) from discontinued operations	(4.9)		3.3
Telair Cargo Group and PSM | Discontinued Operations, Held-for-sale or Disposed of by Sale
Discontinued Operations
Interest Expense	0.0		2.9
General corporate overhead	0.0
Liabilities of discontinued operations	4.9	$ 5.4		$ 5.4
Operating income from discontinued operations
Sales	11.4		74.1
Costs of Sales	(14.8)		(61.2)
Selling, general and administrative expenses	(1.5)		(6.4)
Interest expense, net			(3.2)
Operating income (loss) from discontinued operations	(4.9)		$ 3.3
Telair Cargo Group | Discontinued Operations, Disposed of by Sale
Discontinued Operations
Cash consideration received		705.0
Pre-tax gain on sale of business (net of transaction expenses and fees)		198.6
Telair Cargo Group | A400M | Discontinued Operations, Disposed of by Sale
Discontinued Operations
Gain recognized on sale of business	$ 27.7
Telair Cargo Group | A400M | Maximum | Discontinued Operations, 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