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Geographic and Segment Information - Long-Lived Assets and Concentration Risk (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Total long-lived assets | $ 995.6 | $ 996.7 |
ROU assets | 119.5 |  |
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Total long-lived assets | 515.0 | 521.1 |
Thailand |  |  |
Segment Reporting Information [Line Items] |  |  |
Total long-lived assets | 174.4 | 209.3 |
Various other countries |  |  |
Segment Reporting Information [Line Items] |  |  |
Total long-lived assets | $ 306.2 | $ 266.3 |
Located outside US, in aggregate | Sales | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net sales to unaffiliated customers | 78.00% | 80.00% | 85.00%
Located outside US, in aggregate | Sales | Customer Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net sales to unaffiliated customers | 10.00% | 10.00% |
Europe | Sales | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net sales to unaffiliated customers | 22.00% | 23.00% | 24.00%
Asia | Sales | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net sales to unaffiliated customers | 52.00% | 52.00% | 58.00%
China | Sales | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net sales to unaffiliated customers | 21.00% | 22.00% | 30.00%
Taiwan | Sales | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of net sales to unaffiliated customers | 15.00% | 13.00% | 11.00%

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