Goodwill And Other Intangible Assets (Components Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 23, 2012 Y	Dec. 25, 2011
Finite-Lived Intangible Assets [Line Items]
Total amortized finite-lived intangible assets, Gross Amount	$ 178,601	$ 178,764
Total identifiable intangible assets, Gross Amount	200,110	200,273
Amortized finite-lived intangible assets, Gross Accumulated Amortization	123,156	115,716
Total identifiable assets accumulated amortization	123,156	115,716
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Amortizable Life Minimum (years)	6
Finite-lived intangible assets, Amortizable Life Maximum (years)	20
Finite-lived customer lists, Gross Amount	81,320	81,348
Amortized finite-lived intangible assets, Gross Accumulated Amortization	48,311	43,945
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Amortizable Life Minimum (years)	1
Finite-lived intangible assets, Amortizable Life Maximum (years)	30
Finite-lived trade name, Gross Amount	29,945	30,007
Indefinite-lived trade names, Gross Amount	21,509	21,509
Amortized finite-lived intangible assets, Gross Accumulated Amortization	18,693	18,237
Patents, License Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Amortizable Life Minimum (years)	3
Finite-lived intangible assets, Amortizable Life Maximum (years)	14
Finite-lived patents, license agreements, Gross Amount	60,133	60,249
Amortized finite-lived intangible assets, Gross Accumulated Amortization	49,424	47,704
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Amortizable Life Minimum (years)	2
Finite-lived intangible assets, Amortizable Life Maximum (years)	6
Finite-lived other intangibles, Gross Amount	7,203	7,160
Amortized finite-lived intangible assets, Gross Accumulated Amortization	$ 6,728	$ 5,830