Goodwill and Intangible Assets, Net (Changes in the Carrying Amount of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 30, 2012	Jan. 01, 2012
Changes in the carrying amount of goodwill
Beginning balance	$ 2,094,235	$ 1,504,815
Foreign currency translation	8,871	(256)
Acquisitions, earn outs and other	19,682	589,676
Ending balance	2,122,788	2,094,235
Human Health [Member]
Changes in the carrying amount of goodwill
Beginning balance	1,391,180	974,940
Foreign currency translation	5,894	1,776
Acquisitions, earn outs and other	19,682	414,464
Ending balance	1,416,756	1,391,180
Environmental Health [Member]
Changes in the carrying amount of goodwill
Beginning balance	703,055	529,875
Foreign currency translation	2,977	(2,032)
Acquisitions, earn outs and other	0	175,212
Ending balance	$ 706,032	$ 703,055

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Statement of Financial Accounting Standard (FAS)

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