Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Business Acquisition [Line Items]
Cash consideration, net of cash acquired	$ 4,938	$ 0
Geofinity Manufacturing of Surrey, British Columbia [Member]
Business Acquisition [Line Items]
Cash consideration, net of cash acquired	4,938
Purchase price allocation resulted in acquired technology	3,477
Purchase price allocation, working capital net assets	678
Purchase price allocation, goodwill	783
Radiadores Visconde Ltda [Member]
Business Acquisition [Line Items]
Percentage of interests acquired (in hundredths)	50.00%
Notes payable	2,000
Radiadores Visconde Ltda [Member] \| South America [Member]
Business Acquisition [Line Items]
Selling, General and Administrative Expense Increase Decrease	$ 2,000

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

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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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-Name Statement of Financial Accounting Standard (FAS)

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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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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Topic 230

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