Goodwill And Other Intangible Assets (Components Of Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014
Finite-Lived Intangible Assets [Line Items]
Total amortized finite-lived intangible assets, gross amount	$ 186,757	$ 195,405
Trade names	14,718	20,512
Total identifiable intangible assets, gross amount	201,475	215,917
Gross Accumulated Amortization	153,698	150,977
Customer lists
Finite-Lived Intangible Assets [Line Items]
Total amortized finite-lived intangible assets, gross amount	75,649	79,110
Gross Accumulated Amortization	61,095	58,873
Trade names
Finite-Lived Intangible Assets [Line Items]
Total amortized finite-lived intangible assets, gross amount	24,598	27,172
Gross Accumulated Amortization	16,937	18,031
Patents, license agreements
Finite-Lived Intangible Assets [Line Items]
Total amortized finite-lived intangible assets, gross amount	55,053	58,060
Gross Accumulated Amortization	51,422	52,448
Internal-use software
Finite-Lived Intangible Assets [Line Items]
Total amortized finite-lived intangible assets, gross amount	24,489	24,034
Gross Accumulated Amortization	17,348	14,758
Other
Finite-Lived Intangible Assets [Line Items]
Total amortized finite-lived intangible assets, gross amount	6,968	7,029
Gross Accumulated Amortization	$ 6,896	$ 6,867
Minimum | Customer lists
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortizable life minimum (years)	6 years
Minimum | Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortizable life minimum (years)	1 year
Minimum | Patents, license agreements
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortizable life minimum (years)	3 years
Minimum | Internal-use software
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortizable life minimum (years)	3 years
Minimum | Other
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortizable life minimum (years)	2 years
Maximum | Customer lists
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortizable life minimum (years)	20 years
Maximum | Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortizable life minimum (years)	30 years
Maximum | Patents, license agreements
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortizable life minimum (years)	14 years
Maximum | Internal-use software
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortizable life minimum (years)	7 years
Maximum | Other
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortizable life minimum (years)	6 years