Goodwill And Other Intangible Assets (Components Of Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 27, 2015	Dec. 28, 2014
Finite-Lived Intangible Assets [Line Items]
Total amortized finite-lived intangible assets, gross amount	$ 187,730	$ 195,405
Total identifiable intangible assets, gross amount	208,242	215,917
Total amortized finite-lived intangible assets, gross accumulated amortization	152,469	150,977
Total identifiable intangible assets accumulated amortization	152,469	150,977
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Finite-lived customer lists, gross amount	76,356	79,110
Total amortized finite-lived intangible assets, gross accumulated amortization	60,447	58,873
Trade Name
Finite-Lived Intangible Assets [Line Items]
Finite-lived trade name, gross amount	25,045	27,172
Indefinite-lived trade names, gross amount	20,512	20,512
Total amortized finite-lived intangible assets, gross accumulated amortization	17,101	18,031
Patents, License Agreements
Finite-Lived Intangible Assets [Line Items]
Finite-lived patents, license agreements, gross amount	55,605	58,060
Total amortized finite-lived intangible assets, gross accumulated amortization	51,478	52,448
Software and Software Development Costs
Finite-Lived Intangible Assets [Line Items]
Finite-lived internal-use software, gross amount	23,744	24,034
Total amortized finite-lived intangible assets, gross accumulated amortization	16,553	14,758
Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Finite-lived other intangible assets, gross amount	6,980	7,029
Total amortized finite-lived intangible assets, gross accumulated amortization	$ 6,890	$ 6,867
Minimum | Customer Lists
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	6 years
Minimum | Trade Name
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	1 year
Minimum | Patents, License Agreements
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	3 years
Minimum | Software and Software Development Costs
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	3 years
Minimum | Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	2 years
Maximum | Customer Lists
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	20 years
Maximum | Trade Name
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	30 years
Maximum | Patents, License Agreements
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	14 years
Maximum | Software and Software Development Costs
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	7 years
Maximum | Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	6 years