Acquisitions (Details) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended			12 Months Ended		0 Months Ended			0 Months Ended			12 Months Ended		0 Months Ended				12 Months Ended		1 Months Ended			12 Months Ended		0 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013 Customer relationships	Dec. 28, 2013 Trademarks	Oct. 17, 2013 Energy Micro	Jul. 01, 2013 Energy Micro	Dec. 28, 2013 Energy Micro	Jul. 01, 2013 Energy Micro Core and developed technology	Jul. 01, 2013 Energy Micro Customer relationships	Jul. 01, 2013 Energy Micro Trademarks	Dec. 28, 2013 Energy Micro In-process research and development	Jul. 01, 2013 Energy Micro In-process research and development	Jul. 03, 2012 Ember	Jul. 03, 2012 Ember Developed technology	Jul. 03, 2012 Ember Customer relationships	Jul. 03, 2012 Ember Trademarks	Dec. 28, 2013 Ember In-process research and development	Jul. 03, 2012 Ember In-process research and development	Sep. 30, 2012 Corporate Headquarters Buildings item	Sep. 30, 2012 400 WCC	Sep. 30, 2012 200 WCC	Dec. 31, 2011 Spectra Linear	Jan. 25, 2011 Spectra Linear	Jan. 25, 2011 Spectra Linear Core and developed technology	Jan. 25, 2011 Spectra Linear Customer relationships
Acquisition
Purchase price of acquisition							$ 140,600,000							$ 79,000,000
Estimated fair value														4,000,000										1,000,000
Initial consideration						107,400,000	107,400,000
Deferred consideration in the form of a promissory note, fair value							19,200,000
Restricted stock exchanged of promissory note in form of deferred consideration on acquisition							0.5
Mandatory period of creditor notice after which the deferred consideration in the form of a promissory note will be exchanged for the entity's restricted stock							2 months
Earn-Out, fair value	12,919,000						14,000,000
Additional consideration on acquisition						33,300,000	33,300,000
Minimum annual revenue growth for additional consideration (as a percent)							25.00%
Earn out period							5 years
Maximum annual Earn-Out payment							6,666,666
Minimum revenue in single fiscal year from Earn-Out products required to make the entire Earn-Out amount payable							400,000,000
Amount of initial consideration held in escrow by the company as security for breaches of representations and warranties and certain other expressly enumerated matters						20,300,000	20,300,000
Percentage of Earn-Out contingent on the continued employment of certain key employees							28.76%
Period of continued employment of key employees for calculating Earn-out portion following acquisition date							3 years
Net liabilities assumed																								8,000,000
Post combination expenses, additional compensation paid to employees of acquired entity																							4,500,000
Purchase price allocation
Intangible assets							55,400,000		29,100,000	6,400,000	1,300,000		18,600,000	39,140,000	17,800,000	5,620,000	910,000		14,810,000					17,960,000	16,560,000	1,400,000
Cash and cash equivalents							919,000							3,115,000
Accounts receivable														1,928,000										1,759,000
Inventories														4,749,000										1,199,000
Other current assets							6,486,000							324,000										1,658,000
Goodwill	228,781,000	130,265,000	115,489,000				98,515,000							14,777,000										4,097,000
Deferred tax assets - non-current														16,449,000										12,316,000
Other non-current assets							3,117,000							1,776,000										597,000
Notes payable - current portion																								(4,641,000)
Current liabilities							(8,000,000)							(3,287,000)										(3,112,000)
Non-current deferred tax liabilities, net							(6,288,000)
Long-term debt							(8,434,000)
Other non-current liabilities							(1,133,000)
Non-current liabilities																								(3,254,000)
Total purchase price							140,582,000							78,971,000						94,350,000				28,579,000
Acquisition-related costs recorded in selling, general and administrative expenses								2,400,000
Weighted-Average Amortization Period	9 years			9 years	10 years				7 years	8 years	8 years				11 years	9 years	12 years								10 years	10 years
Discount rate applicable to the cash flows (as a percent)												13.00%						12.50%
Purchase option price for buildings																					44,300,000	50,100,000
Buildings																				90,900,000
Leasehold interest in ground leases																				23,840,000
Acquired unfavorable leases																				(11,925,000)
Lease-related charges																				(8,000)
Net gain on purchase		$ (8,457,000)																		$ (8,457,000)
Useful life of building																				40 years
Useful life of leasehold interest in ground leases																				86 years
Number of leases for which purchase prices were fixed																				2