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Investment in Affiliate (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent owned (in hundredths)	20.00%
Earnings from equity method investments	$ 0.6	$ 0.7	$ 0.3
Nikkei Heat Exchanger [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent owned (in hundredths)	50.00%
Equity method investment	3.2	3.4
Earnings from equity method investments	$ 0.6	$ 0.7	$ 0.3

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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