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Business Segments - Total Business Segments Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 115,753	$ 135,318
Operating Segments | Wind
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	26,390	34,389
Operating Segments | Grid
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	39,200	36,255
Corporate assets
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	$ 50,163	$ 64,674

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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- 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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