Goodwill And Other Intangible Assets (Components Of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2016	Dec. 27, 2015
Finite-Lived Intangible Assets [Line Items]
Total amortized finite-lived intangible assets, gross amount	$ 188,473	$ 186,757
Total identifiable intangible assets, gross amount	203,191	201,475
Total amortized finite-lived intangible assets, gross accumulated amortization	157,718	153,698
Total identifiable intangible assets accumulated amortization	157,718	153,698
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Finite-lived customer lists, gross amount	76,187	75,649
Total amortized finite-lived intangible assets, gross accumulated amortization	62,855	61,095
Trade Name
Finite-Lived Intangible Assets [Line Items]
Finite-lived trade name, gross amount	25,064	24,598
Indefinite-lived trade names, gross amount	14,718	14,718
Total amortized finite-lived intangible assets, gross accumulated amortization	17,382	16,937
Patents, License Agreements
Finite-Lived Intangible Assets [Line Items]
Finite-lived patents, license agreements, gross amount	55,574	55,053
Total amortized finite-lived intangible assets, gross accumulated amortization	52,437	51,422
Software and Software Development Costs
Finite-Lived Intangible Assets [Line Items]
Finite-lived internal-use software, gross amount	24,705	24,489
Total amortized finite-lived intangible assets, gross accumulated amortization	18,155	17,348
Other Intangibles
Finite-Lived Intangible Assets [Line Items]
Finite-lived other intangible assets, gross amount	6,943	6,968
Total amortized finite-lived intangible assets, gross accumulated amortization	$ 6,889	$ 6,896
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