Acquisitions (Details) (USD $)	12 Months Ended					6 Months Ended						1 Months Ended			6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended
	Jun. 28, 2014 acquisitions	Jun. 29, 2013 acquisitions	Jun. 30, 2012 acquisitions		Dec. 28, 2013	Dec. 28, 2013 Volterra [Member]	Dec. 28, 2013 Volterra [Member] Intellectual property [Member]	Dec. 28, 2013 Volterra [Member] Customer relationships [Member]	Dec. 28, 2013 Volterra [Member] Backlog [Member]	Dec. 28, 2013 Volterra [Member] Trade Names [Member]	Dec. 28, 2013 Volterra [Member] Patents [Member]	Jul. 18, 2011 SensorDynamics [Member]	Jun. 30, 2012 SensorDynamics [Member]		Dec. 31, 2011 SensorDynamics [Member] Intellectual property [Member]	Jun. 30, 2012 SensorDynamics [Member] Intellectual property [Member]	Dec. 31, 2011 SensorDynamics [Member] Customer relationships [Member]	Jun. 30, 2012 SensorDynamics [Member] Customer relationships [Member]	Dec. 31, 2011 SensorDynamics [Member] Trademarks [Member]	Jun. 30, 2012 SensorDynamics [Member] Trademarks [Member]	Dec. 28, 2013 Other Acquisition [Member]	Jun. 30, 2012 Other Acquisition [Member]	Jun. 28, 2014 Other Acquisition [Member]	Dec. 31, 2011 Other Acquisition [Member] Intellectual property [Member]	Jun. 30, 2012 Other Acquisition [Member] Intellectual property [Member]	Dec. 31, 2011 Other Acquisition [Member] Customer relationships [Member]	Jun. 30, 2012 Other Acquisition [Member] Customer relationships [Member]	Dec. 31, 2011 Other Acquisition [Member] Trademarks [Member]	Jun. 30, 2012 Other Acquisition [Member] Trademarks [Member]	Jun. 30, 2012 Other Acquisitions [Member]		Jun. 30, 2012 Total Acquisition [Member]
Business Acquisition [Line Items]
Number of Businesses Acquired	2	0	3
Business Combination, Acquisition Related Costs	$ 6,983,000	$ 0	$ 0
Cash paid						593,250,000						123,100,000										41,300,000
Business Acquisition, Cash Paid for Employee's Vested Options						21,756,000
Business Combination, Consideration Transferred						615,006,000															6,100,000
Cash acquired						163,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables						23,453,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory						33,339,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets						17,151,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Accrued Liabilities						(35,343,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Income Tax Payable						(23,241,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other						(20,149,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net						158,710,000
Amortizable intangible assets acquired			38,740,000			226,900,000	192,500,000	24,600,000	900,000	6,400,000	2,500,000		20,900,000			16,400,000		4,100,000		400,000		17,840,000			15,340,000		2,500,000		0	17,840,000
In-process research and development acquired			19,600,000			56,200,000							19,600,000																	0
Goodwill acquired	596,637,000	422,004,000	423,073,000			174,894,000							130,594,000	[1]									500,000							38,392,000	[1]	168,986,000	[1]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable						(1,698,000)
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life							4 years 10 months 24 days	9 years 7 months 6 days	4 months 24 days	4 years	4 years 9 months 18 days				7 years		7 years		3 years					9 years 2 months 12 days		3 years		0 days
Business Combination, Contingent Consideration, Liability																						11,400,000
Business Acquisition, Percentage of Voting Interests Acquired	100.00%				100.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Tangible assets acquired			19,851,000										18,692,000																	1,159,000
Debt assumed			(29,078,000)										(29,078,000)																	0
Business Acquisition Purchase Price Allocation Other Liabilities Assumed			(42,288,000)										(37,559,000)																	(4,729,000)
Business Acquisition, Purchase Price Allocation, Net Tangible Liabilities			(51,515,000)										(47,945,000)																	(3,570,000)
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net			175,811,000	[1]		615,006,000							123,149,000	[1]																52,662,000	[1]
Business Acquisition, Share Price	$ 23
Business Acquisition, Goodwill, Expected Tax Deductible Amount													$ 58,000,000

[1] Includes $11.4 million of contingent consideration relating to the other acquisitions