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Business Segments - Operating Results for Two Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 19,004	$ 12,455	$ 42,727	$ 24,151
Operating loss	(6,841)	(26,400)	(15,098)	(39,067)
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Operating loss	(737)	(5,230)	(2,613)	(8,010)
Wind
Segment Reporting Information [Line Items]
Revenues	13,583	7,462	31,747	15,113
Wind | Operating Segments
Segment Reporting Information [Line Items]
Operating loss	(1,991)	(14,611)	(1,864)	(18,091)
Grid
Segment Reporting Information [Line Items]
Revenues	5,421	4,993	10,980	9,038
Grid | Operating Segments
Segment Reporting Information [Line Items]
Operating loss	$ (4,113)	$ (6,559)	$ (10,621)	$ (12,966)

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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