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Segment Information - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Long lived assets | $ 87,355 |  | $ 87,355 |  | $ 85,408
United States |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Long lived assets | 37,600 |  | 37,600 |  | 37,100
Switzerland |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Long lived assets | 2,000 |  | 2,000 |  | 2,100
China |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Long lived assets | $ 38,100 |  | $ 38,100 |  | $ 37,200
Geographic Concentration | Consolidated net sales from continuing operations | Switzerland |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Percentage of consolidated net sales | 2.00% | 3.00% | 2.00% | 2.00% |

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