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Geographic and Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Segment Net Sales	$ 543,207us-gaap_SalesRevenueNet	$ 528,710us-gaap_SalesRevenueNet	$ 546,243us-gaap_SalesRevenueNet	$ 528,876us-gaap_SalesRevenueNet	$ 493,384us-gaap_SalesRevenueNet	$ 482,372us-gaap_SalesRevenueNet	$ 492,669us-gaap_SalesRevenueNet	$ 462,792us-gaap_SalesRevenueNet	$ 2,147,036us-gaap_SalesRevenueNet	$ 1,931,217us-gaap_SalesRevenueNet	$ 1,581,623us-gaap_SalesRevenueNet
Segment Gross Profit	313,632us-gaap_GrossProfit	301,959us-gaap_GrossProfit	307,454us-gaap_GrossProfit	306,519us-gaap_GrossProfit	290,586us-gaap_GrossProfit	282,720us-gaap_GrossProfit	288,863us-gaap_GrossProfit	266,574us-gaap_GrossProfit	1,229,564us-gaap_GrossProfit	1,128,743us-gaap_GrossProfit	838,459us-gaap_GrossProfit
Semiconductor products [Member]
Segment Reporting Information [Line Items]
Segment Net Sales									2,057,443	1,836,639	1,497,820
Segment Gross Profit									1,139,971	1,034,165	754,656
Technology licensing [Member]
Segment Reporting Information [Line Items]
Segment Net Sales									89,593	94,578	83,803
Segment Gross Profit									$ 89,593	$ 94,578	$ 83,803