Acquisitions and Acquisition-Related Contingent Consideration Acquisitions and Acquisition-Related Contingent Consideration (Details Textual) (USD $)	12 Months Ended						3 Months Ended	12 Months Ended					12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013 Tensilica [Member]	Apr. 22, 2013 Tensilica [Member]	May 23, 2013 Cosmic Circuit Private Limited [Member]	May 23, 2013 Cosmic Circuit Private Limited [Member] Trust For Benefit Of Children of Chief Executive Officer [Member]	Dec. 28, 2013 Other fiscal 2013 acquisitions [Member]	Dec. 28, 2013 2013 Acquisitions [Member]	Dec. 28, 2013 Sigrity [Member]	Dec. 29, 2012 Sigrity [Member]	Jul. 02, 2012 Sigrity [Member]	Dec. 31, 2011 Two Thousand Eleven Acquisition [Member]
Business Acquisition [Line Items]
Total consideration paid								$ 14,400,000
Total consideration paid, net of cash acquired					319,300,000	59,500,000						64,300,000	49,300,000
Cash acquired					26,300,000	1,700,000						7,500,000
Business acquisition fair value of options assumed					15,300,000
Business acquisition fair value of options assumed as consideration					500,000
Business acquisition fair value of options assumed to be expensed over servicer period of award					14,800,000
Additional payments deferred on the acquisition date					5,800,000							14,200,000
Related Party, ownership percentage in acquired company							8.50%
Acquired definite-lived intangible assets, weighted average useful life									8 years		8 years		7 years
Long-term deferred tax liabilities					40,147,000	8,428,000		0				15,100,000
Goodwill, expected tax deductible amount									9,600,000
Acquired intangibles												40,600,000	21,600,000
Goodwill					176,461,000	41,911,000		9,587,000				39,700,000	32,300,000
Valuation Allowance, Deferred Tax Asset, Change in Amount		219,600,000									(14,800,000)
Business combination separately recognized transactions, acquisition costs expensed				1,900,000						7,000,000	3,500,000
Business Combination Cost Expense in Future Periods				3,900,000						3,700,000
Business Combination, Acquisition Related Costs	$ 8,700,000	$ 1,500,000	$ 500,000