Business Combinations (Narrative) (Details) (USD $)	12 Months Ended									12 Months Ended	0 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010	Dec. 28, 2012 Customer Relationships [Member]	Dec. 28, 2012 Developed Product Technology [Member]	Dec. 28, 2012 Trade Names And Trademarks [Member]	Dec. 28, 2012 Distribution Rights And Other Intellectual Properties [Member]	Dec. 28, 2012 Tekla Corporation [Member]	Jul. 08, 2011 Tekla Corporation [Member]	Dec. 28, 2012 TMW Acquisition [Member]	Oct. 02, 2012 TMW Acquisition [Member] Customer Relationships [Member]	Oct. 02, 2012 TMW Acquisition [Member] Developed Product Technology [Member]
Business Acquisition [Line Items]
Significant Acquisition, Percentage of Total Cash Consideration										45.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners								0.54%
Business acquisition, percentage of shares acquired									99.46%
Acquisition-related costs	$ 20,500,000	$ 15,000,000	$ 6,500,000
Business combination, revenue of acquiree										16,500,000
Weighted-average amortization period, years				8 years	6 years	5 years	7 years				8 years	6 years
Acquisition, cash paid								2,500,000
Net deferred tax liabilities	$ 180,587,000	$ 151,321,000