Business Acquisitions (Schedule of Purchase Price Allocation) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Apr. 04, 2016	Mar. 31, 2016	Aug. 03, 2015
Business Acquisition [Line Items]
Goodwill	$ 2,390,955		$ 1,012,652
Atmel Corporation [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		$ 230,266
Accounts receivable		135,427
Inventories		333,208
Prepaid expenses and other current assets		28,360
Assets held for sale		24,394
Property, plant and equipment, net		129,587
Goodwill		1,378,317
Purchased intangible assets		1,880,245
Long-term deferred tax assets		49,466
Other assets		5,948
Total assets acquired		4,195,218
Accounts payable		(55,686)
Other current liabilities		(119,152)
Long-term line of credit		(192,000)
Deferred tax liabilities		(74,334)
Long-term income tax payable		(174,380)
Other long-term liabilities		(106,688)
Total liabilities assumed		(722,240)
Purchase price allocated		$ 3,472,978
Micrel Incorporated [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	99,196		99,196
Accounts receivable	14,096		14,096
Inventories	73,468		73,468
Prepaid expenses and other current assets	10,652		10,652
Property, plant and equipment, net	38,491		38,566
Goodwill	440,978		440,992
Purchased intangible assets	273,500		273,500
Long-term deferred tax assets				$ 11,400
Other assets	4,268		4,268
Total assets acquired	954,649		954,738
Accounts payable	(11,068)		(11,068)
Other current liabilities	(31,552)		(31,641)
Deferred tax liabilities	(88,035)		(88,035)
Long-term income tax payable	(7,637)		(7,637)
Other long-term liabilities	(127)		(127)
Total liabilities assumed	(138,419)		(138,508)
Purchase price allocated	816,230		$ 816,230
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Property,plant and equipment, net	(75)
Goodwill	(14)
Total assets acquired	(89)
Other current liabilities	89
Total liabilities assumed	$ 89