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Segment Information - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
Segment Reporting Information [Line Items]
Long lived assets	$ 83,731		$ 83,731		$ 86,304
Switzerland
Segment Reporting Information [Line Items]
Long lived assets	1,600		1,600		1,900
United States
Segment Reporting Information [Line Items]
Long lived assets	33,500		33,500		35,300
China
Segment Reporting Information [Line Items]
Long lived assets	$ 38,200		$ 38,200		$ 37,900
Geographic Concentration | Consolidated net sales from continuing operations | Switzerland
Segment Reporting Information [Line Items]
Percentage of consolidated net sales	4.00%	2.00%	3.00%	2.00%

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