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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Segment reporting information [Line Items]
Net sales	$ 528,710us-gaap_SalesRevenueNet	$ 482,372us-gaap_SalesRevenueNet	$ 1,603,829us-gaap_SalesRevenueNet	$ 1,437,833us-gaap_SalesRevenueNet
Gross Profit	301,959us-gaap_GrossProfit	282,720us-gaap_GrossProfit	915,932us-gaap_GrossProfit	838,157us-gaap_GrossProfit
Semiconductor products [Member]
Segment reporting information [Line Items]
Net sales	505,763	458,298	1,537,861	1,366,415
Gross Profit	279,012	258,646	849,964	766,739
Technology licensing [Member]
Segment reporting information [Line Items]
Net sales	22,947	24,074	65,968	71,418
Gross Profit	$ 22,947	$ 24,074	$ 65,968	$ 71,418