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Business Segments - Total Business Segments Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 134,260	$ 133,825
Operating Segments | Wind
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	34,391	41,947
Operating Segments | Grid
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	38,821	42,482
Corporate assets
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 61,048	$ 49,396

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.18)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 12



-Article 7

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- Definition

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+ References

No definition available.

+ Details

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