Business Acquisitions (Schedule of Purchase Price Allocation) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Apr. 04, 2016	Mar. 31, 2016	Aug. 03, 2015
Business Acquisition [Line Items]
Goodwill	$ 2,362,090				$ 1,012,652
Atmel Corporation
Business Acquisition [Line Items]
Cash and cash equivalents	230,266	$ 230,266
Accounts receivable	141,359	135,427
Inventories	335,163	335,163
Prepaid expenses and other current assets	28,360	28,360
Assets held for sale	32,006	24,394
Property, plant and equipment, net	129,587	129,587
Goodwill	1,349,452	1,372,102
Purchased intangible assets	1,877,945	1,877,945
Long-term deferred tax assets	49,360	49,360
Other assets	7,535	7,535
Total assets acquired	4,181,033	4,190,139
Accounts payable	(55,686)	(55,686)
Other current liabilities	(121,584)	(119,469)
Long-term line of credit	(192,000)	(192,000)
Deferred tax liabilities	(76,496)	(74,885)
Long-term income tax payable	(155,601)	(168,433)
Other long-term liabilities	(106,688)	(106,688)
Total liabilities assumed	(708,055)	(717,161)		$ (708,100)
Purchase price allocated	3,472,978	$ 3,472,978
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Accounts receivable	5,932
Assets held for sale	7,612
Goodwill	(22,650)
Total assets acquired	(9,106)
Other current liabilities	(2,115)
Deferred tax liabilities	(1,611)
Long-term income tax payable	12,832
Total liabilities assumed	$ 9,106
Micrel Incorporated
Business Acquisition [Line Items]
Cash and cash equivalents			$ 99,196
Accounts receivable			14,096
Inventories			73,468
Prepaid expenses and other current assets			10,652
Property, plant and equipment, net			38,491
Goodwill			440,978
Purchased intangible assets			273,500
Long-term deferred tax assets						$ 11,400
Other assets			4,268
Total assets acquired			954,649
Accounts payable			(11,068)
Other current liabilities			(31,552)
Deferred tax liabilities			(88,035)
Long-term income tax payable			(7,637)
Other long-term liabilities			(127)
Total liabilities assumed			(138,419)
Purchase price allocated			$ 816,230