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Business Segments - Operating Results for Two Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 14,876	$ 11,049	$ 27,483	$ 19,971
Operating profit/(loss)	24,727	(7,805)	19,600	(22,499)
Unallocated corporate expenses
Segment Reporting Information [Line Items]
Operating profit/(loss)	(918)	(265)	(2,013)	(2,358)
Wind
Segment Reporting Information [Line Items]
Revenues	7,307	5,554	10,985	7,831
Wind | Operating Segments
Segment Reporting Information [Line Items]
Operating profit/(loss)	28,515	(1,440)	27,150	(5,873)
Grid
Segment Reporting Information [Line Items]
Revenues	7,569	5,495	16,498	12,140
Grid | Operating Segments
Segment Reporting Information [Line Items]
Operating profit/(loss)	$ (2,870)	$ (6,100)	$ (5,537)	$ (14,268)

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