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Segment Information (Net Sales by Geographic Region) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Net sales to unaffiliated customers and long-lived assets by geographic region
Net sales	$ 2,566,863	$ 2,221,427	$ 2,018,100
Americas
Net sales to unaffiliated customers and long-lived assets by geographic region
Net sales	1,118,324	963,674	881,379
EMEA
Net sales to unaffiliated customers and long-lived assets by geographic region
Net sales	820,347	746,898	645,694
Asia Pacific
Net sales to unaffiliated customers and long-lived assets by geographic region
Net sales	$ 628,192	$ 510,855	$ 491,027
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%	37.00%	38.00%
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)	16.00%	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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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