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Segment Information (Net Sales by Geographic Region) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Net sales | $ 2,221,427 | $ 2,018,100 | $ 2,004,908
Americas |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Net sales | 963,674 | 881,379 | 864,761
EMEA |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Net sales | 746,898 | 645,694 | 670,890
Asia Pacific |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Net sales | $ 510,855 | $ 491,027 | $ 469,257
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) | 37.00% | 38.00% | 36.00%
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) | 17.00% |  |
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) | 2.00% | 2.00% | 2.00%

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