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Business Segments - Operating Results for Two Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 14,134	$ 14,933	$ 41,618	$ 34,904
Operating profit/(loss)	20,765	(3,851)	40,366	(26,350)
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Operating profit/(loss)	(839)	(1,156)	(2,851)	(3,514)
Wind
Segment Reporting Information [Line Items]
Revenues	7,308	2,633	18,293	10,465
Wind | Operating Segments
Segment Reporting Information [Line Items]
Operating profit/(loss)	24,269	(1,684)	51,419	(7,557)
Grid
Segment Reporting Information [Line Items]
Revenues	6,826	12,300	23,325	24,439
Grid | Operating Segments
Segment Reporting Information [Line Items]
Operating profit/(loss)	$ (2,665)	$ (1,011)	$ (8,202)	$ (15,279)

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