Business Combinations and Asset Purchases (Narrative) (Details) (USD $)	12 Months Ended				1 Months Ended		1 Months Ended	12 Months Ended									12 Months Ended
	Dec. 30, 2012 years	Jan. 01, 2012	Jan. 02, 2011	Jan. 03, 2010	Oct. 25, 2011 2021 Notes [Member]	Dec. 30, 2012 2021 Notes [Member]	Jan. 01, 2012 November 2011 Caliper Life Sciences [Member]	Jan. 01, 2012 Minimum [Member]	Jan. 01, 2012 Maximum [Member]	Nov. 30, 2012 Human Health [Member] November 2012 Haoyuan Biotech Co. [Member]	Jun. 30, 2011 Human Health [Member] June 2011 Dexela Limited [Member]	May 31, 2011 Human Health [Member] May 2011 Geospiza, Inc [Member]	Mar. 31, 2011 Human Health [Member] March 2011 ID Biological Systems, Inc [Member]	Feb. 28, 2011 Human Health [Member] February 2011 Chemagen Biopolymer-Technologie AG [Member]	Jan. 01, 2012 Human Health [Member] November 2011 Caliper Life Sciences [Member]	Nov. 30, 2011 Human Health [Member] November 2011 Caliper Life Sciences [Member]	Dec. 30, 2012 Human Health [Member] Core Technology [Member] November 2012 Haoyuan Biotech Co. [Member]	Jan. 01, 2012 Human Health [Member] Core Technology [Member] November 2011 Caliper Life Sciences [Member]	Dec. 30, 2012 Human Health [Member] Trade Names [Member] November 2012 Haoyuan Biotech Co. [Member]	Jan. 01, 2012 Human Health [Member] Trade Names [Member] November 2011 Caliper Life Sciences [Member]	Jan. 01, 2012 Human Health [Member] Licenses [Member] November 2011 Caliper Life Sciences [Member]	Jan. 01, 2012 Human Health [Member] Customer Relationships [Member] November 2011 Caliper Life Sciences [Member]	May 31, 2011 Environmental Health [Member] May 2011 Labtronics, Inc [Member]	Apr. 30, 2011 Environmental Health [Member] April 2011 CambridgeSoft Corporation [Member]	Mar. 31, 2011 Environmental Health [Member] March 2011 ArtusLabs, Inc [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation Adjustment, Current Assets															$ 20,800,000
Business Acquisition, Cost of Acquired Entity, Cash Paid Including Working Capital And Other Adjustments											26,100,000	13,200,000		34,600,000									11,400,000
Business Acquisition, Cost of Acquired Entity, Cash Paid										38,000,000	24,800,000	13,250,000	7,664,000	33,873,000		646,317,000							11,389,000	227,373,000	15,232,000
Unsecured senior notes, face value					500,000,000	500,000,000
Proceeds from the issuance of debt instrument					496,900,000
Debt instrument maturity date					Nov. 25, 2021
Unsecured senior notes, interest rate percent					5.00%
Working capital and other adjustments										(2,729,000)	1,251,000	729,000	0	762,000									29,000	(4,156,000)	0
Gain on step acquisition	0	0	(25,586,000)
Aggregate revenue from immaterial acquisitions		32,400,000
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	3,017,000	20,298,000	1,731,000	4,251,000
Business Combination, Contingent Consideration Arrangements, Description	P3Y
Additional contingent consideration	61,300,000									30,000,000	12,200,000		3,300,000	20,300,000											15,000,000
Contingent consideration										1,900,000	4,600,000	0	326,000	7,723,000									0	0	7,475,000
Weighted average amortization period (in years)								7 years	11 years								8 years	5 years	8 years	7 years	6 years	7 years
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual							29,300,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual							(3,000,000)
Deferred revenue acquisition liability										0	0	380,000	0	0		6,554,000							315,000	9,504,000	297,000
Total transaction costs	1,200,000	10,700,000	2,600,000
Number of Years in Measurement Period from Acquisition Date to Change Underlying Assumptions	1
Business Acquisition, Purchase Price Allocation Adjustment, Goodwill Amount															600,000
Business Acquisition, Purchase Price Allocation Adjustment, Other Noncurrent Liabilities															22,800,000
Business Acquisition, Purchase Price Allocation Adjustment, Current Liabilities, Accrued Liabilities															$ (1,400,000)