Business Acquisitions (Schedule of Purchased Intangible Assets) (Details) - USD ($) $ in Thousands				12 Months Ended
	Aug. 03, 2015	Jul. 17, 2014	Apr. 01, 2014	Mar. 31, 2016
Core/developed technology
Business Acquisition [Line Items]
Purchased intangible assets				$ 175,800
In-process technology
Business Acquisition [Line Items]
Purchased intangible assets				21,000
Backlog
Business Acquisition [Line Items]
Purchased intangible assets				$ 5,600
Micrel Incorporated [Member]
Business Acquisition [Line Items]
Purchased intangible assets	$ 273,500
Micrel Incorporated [Member] | Core/developed technology
Business Acquisition [Line Items]
Useful life	10 years
Purchased intangible assets	$ 175,800
Micrel Incorporated [Member] | In-process technology
Business Acquisition [Line Items]
Useful life	10 years
Purchased intangible assets	$ 21,000
Micrel Incorporated [Member] | Customer-related
Business Acquisition [Line Items]
Useful life	5 years
Purchased intangible assets	$ 71,100
Micrel Incorporated [Member] | Backlog
Business Acquisition [Line Items]
Useful life	1 year
Purchased intangible assets	$ 5,600
ISSC Technologies Corporation [Member]
Business Acquisition [Line Items]
Purchased intangible assets		$ 147,800
ISSC Technologies Corporation [Member] | Core/developed technology
Business Acquisition [Line Items]
Useful life		10 years
Purchased intangible assets		$ 68,900
ISSC Technologies Corporation [Member] | In-process technology
Business Acquisition [Line Items]
Useful life		10 years
Purchased intangible assets		$ 27,200
ISSC Technologies Corporation [Member] | Customer-related
Business Acquisition [Line Items]
Useful life		3 years
Purchased intangible assets		$ 51,100
ISSC Technologies Corporation [Member] | Backlog
Business Acquisition [Line Items]
Useful life		1 year
Purchased intangible assets		$ 600
Supertex Inc. [Member]
Business Acquisition [Line Items]
Purchased intangible assets			$ 89,600
Supertex Inc. [Member] | Core/developed technology
Business Acquisition [Line Items]
Useful life			10 years
Purchased intangible assets			$ 68,900
Supertex Inc. [Member] | In-process technology
Business Acquisition [Line Items]
Useful life			10 years
Purchased intangible assets			$ 1,900
Supertex Inc. [Member] | Customer-related
Business Acquisition [Line Items]
Useful life			2 years
Purchased intangible assets			$ 17,700
Supertex Inc. [Member] | Backlog
Business Acquisition [Line Items]
Useful life			1 year
Purchased intangible assets			$ 1,100