Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Aug. 31, 2015	May 31, 2015	May 31, 2016	May 31, 2015	May 31, 2014
Discontinued Operations
Pre-tax gain on sale of business (net of transaction expenses and fees)			$ 27.7	$ 198.6
Recognized impairment charge				57.5
Interest expense			6.4	26.5	$ 28.3
Operating income from discontinued operations
Operating income (loss) from discontinued operations			(8.2)	(1.5)	6.5
Telair Cargo Group and PSM | Discontinued Operations, Held-for-sale or Disposed of by Sale
Discontinued Operations
Interest expense			0.0	9.2	13.0
General corporate overhead			0.0
Operating income from discontinued operations
Sales			47.7	286.3	325.9
Costs of Sales			50.5	249.7	274.6
Selling, general and administrative expenses			5.4	28.0	31.2
Interest expense, net				10.1	13.6
Operating income (loss) from discontinued operations			(8.2)	(1.5)	$ 6.5
Telair Cargo Group and PSM | Accrued Liabilities. | Discontinued Operations, Held-for-sale or Disposed of by Sale
Assets and liabilities held for sale related to discontinued operations
Liabilities of discontinued operations		$ 5.4	$ 6.9	5.4
Telair Cargo Group
Discontinued Operations
Pre-tax gain on sale of business (net of transaction expenses and fees)	$ 27.7	198.6
Gain recognized on sale of business				49.7
Telair Cargo Group | Discontinued Operations, Disposed of by Sale
Discontinued Operations
Cash consideration received before fees and expenses		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