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Revenue and Assets by Geographic Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Amount of identifiable long-lived assets (consisting of property, plant and equipment) | $ 767.9 | $ 683.3 |
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Amount of identifiable long-lived assets (consisting of property, plant and equipment) | 393.3 | 388.5 |
Thailand |  |  |
Segment Reporting Information [Line Items] |  |  |
Amount of identifiable long-lived assets (consisting of property, plant and equipment) | 215.5 | 178.0 |
Various Other Countries besides United States and Thailand |  |  |
Segment Reporting Information [Line Items] |  |  |
Amount of identifiable long-lived assets (consisting of property, plant and equipment) | $ 159.1 | $ 116.8 |
Located outside US, in aggregate |  |  |
Geographic Areas, Revenues from External Customers [Abstract] |  |  |
Percentage of net sales to unaffiliated customers | 85.00% | 84.00% | 84.00%
Europe |  |  |
Geographic Areas, Revenues from External Customers [Abstract] |  |  |
Percentage of net sales to unaffiliated customers | 24.00% | 24.00% | 22.00%
Asia |  |  |
Geographic Areas, Revenues from External Customers [Abstract] |  |  |
Percentage of net sales to unaffiliated customers | 58.00% | 58.00% | 59.00%
China, including Hong-Kong |  |  |
Geographic Areas, Revenues from External Customers [Abstract] |  |  |
Percentage of net sales to unaffiliated customers | 30.00% | 32.00% | 30.00%
Taiwan |  |  |
Geographic Areas, Revenues from External Customers [Abstract] |  |  |
Percentage of net sales to unaffiliated customers | 11.00% | 9.00% | 12.00%

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