Goodwill and Intangible Assets, Net (Changes in the Carrying Amount of Goodwill) (Details) (USD $) In Thousands	9 Months Ended
Oct. 02, 2011
Changes in the carrying amount of goodwill
Balance at January 2, 2011	$ 1,504,815
Foreign currency translation	13,579
Acquisitions, earn outs and other	240,011
Balance at October 2, 2011	1,758,405
Human Health [Member]
Changes in the carrying amount of goodwill
Balance at January 2, 2011	974,940
Foreign currency translation	10,020
Acquisitions, earn outs and other	62,480
Balance at October 2, 2011	1,047,440
Environmental Health [Member]
Changes in the carrying amount of goodwill
Balance at January 2, 2011	529,875
Foreign currency translation	3,559
Acquisitions, earn outs and other	177,531
Balance at October 2, 2011	$ 710,965

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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-Name Statement of Financial Accounting Standard (FAS)

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 5: http://www.xbrl.org/2003/role/presentationRef

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

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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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