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Business Segments - Total Business Segments Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 135,318	$ 133,825
Operating Segments | Wind
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	34,389	41,947
Operating Segments | Grid
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	36,255	42,482
Corporate assets
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 64,674	$ 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

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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