Acquisitions (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended				3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012 Geofinity Manufacturing of Surrey, British Columbia [Member]	Dec. 31, 2012 Radiadores Visconde Ltda [Member]	Sep. 30, 2012 Radiadores Visconde Ltda [Member] South America [Member]
Business Acquisition [Line Items]
Cash consideration, net of cash acquired	$ 0	$ 4.9	$ 4.9
Purchase price allocation resulted in acquired technology			3.5
Purchase price allocation, working capital net assets			0.6
Purchase price allocation, goodwill			0.8
Acquired technology, amortization period			10 years
Percentage of interests acquired (in hundredths)				50.00%
Notes payable				2.0
Selling, General and Administrative Expense Increase Decrease					$ 2.0