Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Jan. 01, 2012
Change in estimated fair value of the contingent consideration liability
Change in estimated fair value, recorded in acquisition related (gain) expense, net	$ (18,784)	$ 1,975	$ (4,500)
Level 3 [Member]
Liability:
Acquisition related contingent consideration liabilities	49,480	12,519	6,638
Change in estimated fair value of the contingent consideration liability
Balance as of beginning of period	12,519	6,638	3,738
Additional liability recorded for acquisitions	60,184
Change in estimated fair value, recorded in acquisition related (gain) expense, net	(18,784)	1,975	(4,500)
Cash payments	(4,439)	(3,594)
Balance as of end of period	49,480	12,519	6,638
Level 3 [Member] | Epicentre [Member]
Change in estimated fair value of the contingent consideration liability
Additional liability recorded for acquisitions			7,400
Level 3 [Member] | BlueGnome [Member]
Change in estimated fair value of the contingent consideration liability
Additional liability recorded for acquisitions		7,500
Fair Value, Measurements, Recurring [Member]
Assets:
Money market funds (cash equivalent)	478,755	252,126
Deferred compensation plan assets	17,805	13,626
Total assets measured at fair value	950,526	1,181,975
Liability:
Acquisition related contingent consideration liabilities	49,480	12,519
Deferred compensation liability	14,957	12,071
Total liabilities measured at fair value	64,437	24,590
Change in estimated fair value of the contingent consideration liability
Balance as of end of period	49,480	12,519
Fair Value, Measurements, Recurring [Member] | Debt securities in government sponsored entities [Member]
Assets:
Investments, fair value disclosure	82,143	314,873
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]
Assets:
Investments, fair value disclosure	341,970	472,861
Fair Value, Measurements, Recurring [Member] | U.S. Treasury securities [Member]
Assets:
Investments, fair value disclosure	29,853	128,489
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Money market funds (cash equivalent)	478,755	252,126
Total assets measured at fair value	508,608	380,615
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury securities [Member]
Assets:
Investments, fair value disclosure	29,853	128,489
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets:
Deferred compensation plan assets	17,805	13,626
Total assets measured at fair value	441,918	801,360
Liability:
Deferred compensation liability	14,957	12,071
Total liabilities measured at fair value	14,957	12,071
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Debt securities in government sponsored entities [Member]
Assets:
Investments, fair value disclosure	82,143	314,873
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate debt securities [Member]
Assets:
Investments, fair value disclosure	341,970	472,861
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Liability:
Acquisition related contingent consideration liabilities	49,480	12,519
Total liabilities measured at fair value	49,480	12,519
Change in estimated fair value of the contingent consideration liability
Balance as of end of period	$ 49,480	$ 12,519