CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012
Cash Flows From Operating Activities
Net Earnings	$ 225,573	$ 210,822	$ 149,126
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation and amortization	35,515	37,316	38,762
Deferred income taxes	329	(1,715)	(10,786)
Share-based compensation	17,249us-gaap_ShareBasedCompensation	16,545us-gaap_ShareBasedCompensation	12,409us-gaap_ShareBasedCompensation
Excess tax benefit related to share-based payment arrangements	(6,634)	(8,347)	(4,217)
Change in
Accounts receivable	(26,557)us-gaap_IncreaseDecreaseInReceivables	(11,880)us-gaap_IncreaseDecreaseInReceivables	(2,752)us-gaap_IncreaseDecreaseInReceivables
Inventories	(15,079)us-gaap_IncreaseDecreaseInInventories	(10,186)us-gaap_IncreaseDecreaseInInventories	5,941us-gaap_IncreaseDecreaseInInventories
Trade accounts payable	450	2,436	(952)
Salaries and incentives	1,520	2,022	(4,251)
Retirement benefits and deferred compensation	5,052	3,629	3,209
Other accrued liabilities	6,151	5,556	3,288
Other	(2,314)	(3,143)	(95)
Net cash from operating activities	241,255	243,055	189,682
Cash Flows From Investing Activities
Property, plant and equipment additions	(30,636)	(23,319)	(18,234)
Acquisition of businesses, net of cash acquired	(185,462)	(11,560)	(240,068)
Investment in businesses held separate	530us-gaap_PaymentsToAcquireInvestments	4,516us-gaap_PaymentsToAcquireInvestments	(426,813)us-gaap_PaymentsToAcquireInvestments
Proceeds from sale of assets	0	1,600	0
Other	(1,163)	(2,475)	(9,405)
Net cash used in investing activities	(216,731)	(31,238)	(694,520)
Cash Flows From Financing Activities
Borrowings (payments) on short-term lines of credit, net	(4,459)	1,280	(619)
Borrowings on notes and long-term line of credit	717,845	419,905	649,325
Payments on long-term line of credit	(511,215)us-gaap_RepaymentsOfLongTermDebt	(568,122)us-gaap_RepaymentsOfLongTermDebt	(392,845)us-gaap_RepaymentsOfLongTermDebt
Payments of debt issuance costs	(890)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	(1,921)us-gaap_PaymentsOfDebtIssuanceCosts
Excess tax benefit related to share-based payment arrangements	6,634	8,347	4,217
Common stock issued	30,199	41,664	30,194
Common stock repurchased	(195,326)	(67,827)	(1,378)
Cash dividends paid	(66,362)us-gaap_PaymentsOfDividends	(61,139)us-gaap_PaymentsOfDividends	(54,302)us-gaap_PaymentsOfDividends
Net cash from (used in) financing activities	(23,574)	(225,892)	232,671
Effect of exchange rate changes on cash	2,950	2,711	137
Net increase (decrease) in cash and cash equivalents	3,900	(11,364)	(272,030)
Cash and Cash Equivalents
Beginning of year	19,756	31,120	303,150
End of year	$ 23,656	$ 19,756	$ 31,120

Name:	us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.