Acquisitions (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Jan. 01, 2012
Contingent compensation expense [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Contingent compensation expense	$ 13,610	$ 9,151	$ 6,057
Contingent compensation expense [Member] | Research and development expense [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Contingent compensation expense	544	3,419	4,799
Contingent compensation expense [Member] | Selling, general and administrative expense [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Contingent compensation expense	13,066	5,732	1,258
IPR&D [Member] | Acquisition related expense (gain), net [Member]
Business Combination, Separately Recognized Transactions [Line Items]
IPR&D, included in acquisition related expense (gain), net			$ 5,425