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Segment Information (Net Sales by Geographic Region) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Net sales | $ 2,788,322 | $ 2,566,863 | $ 2,221,427
Americas |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Net sales | 1,190,216 | 1,118,324 | 963,674
EMEA |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Net sales | 861,731 | 820,347 | 746,898
Asia Pacific |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Net sales | $ 736,375 | $ 628,192 | $ 510,855
Geographic Concentration | Consolidated net sales | United States |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Concentration credit risk by major customer (as a percent) | 36.00% | 37.00% | 37.00%
Geographic Concentration | Consolidated net sales | Germany |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Concentration credit risk by major customer (as a percent) | 18.00% | 16.00% | 17.00%
Geographic Concentration | Consolidated net sales | China |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Concentration credit risk by major customer (as a percent) | 10.00% |  |
Geographic Concentration | Consolidated net sales | Switzerland |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Concentration credit risk by major customer (as a percent) | 3.00% | 2.00% | 2.00%

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