Acquisitions (Narrative) (Detail) (USD $)	3 Months Ended	6 Months Ended					6 Months Ended		6 Months Ended
	Jul. 01, 2012	Jul. 01, 2012	Jun. 26, 2011	Jul. 01, 2012 Intellectual Property [Member]	Jul. 01, 2012 In Process Research And Development [Member]	Jul. 01, 2012 Minimum [Member]	Jul. 01, 2012 Minimum [Member] Intellectual Property [Member]	Jul. 01, 2012 Maximum [Member]	Jul. 01, 2012 Maximum [Member] Intellectual Property [Member]	Jun. 22, 2012 Hotspur Technologies [Member]	May 22, 2012 Semprus BioSciences [Member]	May 03, 2012 Axiom Technology Partners LLC [Member]	Apr. 05, 2012 EZ-Blocker Product Line [Member]
Initial payment made on acquisition	$ 55,800,000	$ 55,800,000								$ 15,000,000	$ 30,000,000	$ 7,500,000	$ 3,300,000
Fair value of the consideration at the date of acquisition	111,900,000	111,900,000
Estimated fair value of the consideration to be paid to former security holders	56,100,000	56,100,000
Aggregate contingent consideration paid on achievement of specified objectives	58,230,000	58,230,000	9,530,000			61,000,000		90,000,000
Business acquisitions, transaction expenses	800,000	600,000
Business acquisitions, operating loss		1,600,000
Estimated fair value intangible assets acquired				$ 48,700,000	$ 45,500,000
Useful life of intangible assets acquired, years							15 years		20 years