Acquisitions (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		3 Months Ended					1 Months Ended	3 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Aug. 31, 2012 Telair and Nordisk	Nov. 30, 2011 Telair and Nordisk	Nov. 30, 2012 Telair and Nordisk	May 31, 2012 Telair and Nordisk	Dec. 02, 2011 Telair and Nordisk	Oct. 31, 2011 Airinmar	Feb. 28, 2013 Airinmar	May 31, 2012 Airinmar	Nov. 30, 2012 Airinmar Y	Oct. 31, 2012 Airinmar	Feb. 29, 2012 Airinmar	Oct. 11, 2011 Airinmar
Acquisitions
Purchase price of the acquisition						$ 296.5	$ 280.0							$ 43.5
Cash consideration paid	16.5	298.1	16.5					23.2
Potential earn-out payment														20.3
Period over which EBITDA levels will be measured (in years)											2
Estimated liability of the acquisition date fair value of the earn-out													20.3
Reduction in liability of the acquisition date fair value of the earn-out									9.0	3.4
Adjustment amount between goodwill and identified intangibles				11.0
Purchase price allocation
Cash					1.5							3.7
Accounts receivable					47.1							8.0
Inventories					54.5
Prepaid expenses					4.1							0.9
Property, plant and equipment					17.0							0.6
Deferred tax assets					34.3							5.3
Goodwill					103.9							21.6
Identified intangibles					120.0							20.8
Notes payable					(1.6)
Accounts payable					(14.7)							(6.7)
Deferred tax liabilities					(34.3)							(5.3)
Accrued liabilities					(27.5)							(5.4)
Other long-term liabilities					(7.8)
Settlement amount for the earn-out									$ 4.6