Acquisitions (Details) (USD $)	12 Months Ended						1 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended	12 Months Ended		1 Months Ended				12 Months Ended		1 Months Ended		1 Months Ended			1 Months Ended
	Dec. 29, 2012	Dec. 29, 2012 Customer relationships	Dec. 29, 2012 Trademarks	Dec. 29, 2012 Core and developed technology	Dec. 29, 2012 Ember Corporation	Jul. 03, 2012 Ember Corporation	Jul. 31, 2012 Ember Corporation Developed technology	Jul. 03, 2012 Ember Corporation Developed technology	Jul. 31, 2012 Ember Corporation Customer relationships	Jul. 03, 2012 Ember Corporation Customer relationships	Jul. 31, 2012 Ember Corporation Trademarks	Jul. 03, 2012 Ember Corporation Trademarks	Jul. 31, 2012 Ember Corporation In Process research and development	Dec. 29, 2012 Ember Corporation In Process research and development	Jul. 03, 2012 Ember Corporation In Process research and development	Sep. 30, 2012 Headquarters leases item	Sep. 28, 2012 Headquarters leases	Dec. 29, 2012 400 WCC	Dec. 29, 2012 200 WCC	Dec. 31, 2011 Spectra Linear	Jan. 25, 2011 Spectra Linear	Jan. 31, 2011 Spectra Linear Customer relationships	Jan. 25, 2011 Spectra Linear Customer relationships	Jan. 31, 2011 Spectra Linear Core and developed technology	Jan. 25, 2011 Spectra Linear Core and developed technology	Apr. 30, 2010 Silicon Clocks, Inc	Apr. 30, 2010 Silicon Clocks, Inc Developed technology	Apr. 30, 2010 Silicon Clocks, Inc Customer relationships	Apr. 30, 2010 Silicon Clocks, Inc In Process research and development	Oct. 31, 2010 Chip Sensors
Business acquisition
Purchase price of acquisition						$ 79,000,000
Estimated fair value of contingent consideration						4,000,000															1,000,000
Minimum revenue of acquired products					27,000,000
Net liabilities assumed																					8,000,000
Post combination expenses, additional compensation paid to employees of acquired entity																				4,500,000
Consideration paid in cash for acquisition																										21,000,000
Number of years over which minimum revenue generate					1 year
Purchase price allocation
Indefinite intangible assets															14,810,000														9,470,000
Finite intangible assets								17,800,000		5,620,000		910,000											1,400,000		16,560,000		230,000	30,000
Intangible assets						39,140,000															17,960,000					9,730,000				9,100,000
Cash and cash equivalents						3,115,000																				514,000
Accounts receivable						1,928,000															1,759,000
Inventories						4,749,000															1,199,000
Other current assets						324,000															1,658,000					473,000
Goodwill						14,777,000															4,097,000					3,209,000				3,100,000
Deferred tax assets - non-current																					12,316,000					11,521,000
Non-current deferred tax assets, net						16,449,000
Other non-current assets						1,776,000															597,000					322,000
Notes payable - current portion																					(4,641,000)
Current liabilities						(3,287,000)															(3,112,000)					(1,338,000)
Deferred tax liabilities - non-current																										(3,406,000)
Net tangible assets																														(500,000)
Total purchase price						78,971,000															28,579,000					21,025,000				11,700,000
Non-current liabilities																					(3,254,000)
Weighted-Average Amortization Period	10 years	9 years	12 years	10 years			11 years		9 years		12 years											10 years		10 years			3 years	2 years
Discount rate applicable to the cash flows (as a percent)														12.50%															19.00%
Estimated costs													11,200,000
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)
Total purchase price																	$ 94,350,000
Useful life of building																40 years
Useful life of leasehold interest in ground leases																86 years
Number of leases purchase price fixed																2