Acquisitions (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Cash consideration, net of cash acquired	$ 4.9	$ 0
Geofinity Manufacturing of Surrey, British Columbia [Member]
Business Acquisition [Line Items]
Cash consideration, net of cash acquired	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
Radiadores Visconde Ltda [Member]
Business Acquisition [Line Items]
Percentage of interests acquired (in hundredths)	50.00%
Notes payable	2.0
Radiadores Visconde Ltda [Member] \| South America [Member]
Business Acquisition [Line Items]
Selling, General and Administrative Expense Increase Decrease	$ 2.0

Selling, general and administrative expenses increase or decrease during the reporting period.

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- Definition

Percentage of voting equity interests acquired in the business combination.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Amount assigned in the purchase price allocation to the preacquisition contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 2

-Section A

-Subsection 7

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- Definition

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The amount of acquisition cost of a business combination allocated to current assets.

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- Definition

Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

+ References

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-Publisher FASB

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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