CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Cash flows from operating activities
Net income	$ 100,837	$ 139,966	$ 127,460
Adjustments to reconcile net income to net cash provided by operating activities:
Pension settlement expense	80,641	0	0
Depreciation and amortization	62,136	60,661	59,011
Amortization of right of use asset	8,568	7,384
Stock-based compensation expense	14,437	12,948	12,959
Gain from joint ventures	(5,000)	0	(10,764)
Deferred income taxes	(16,043)	4,242	4,047
Gain on non-marketable equity investment	(10,074)	(1,886)	0
Long-term retirement benefit obligations	(17,166)	(22,914)	(46,877)
Fair market value adjustment on life insurance products	(578)	(3,461)	821
Uncertain tax positions	0	(4,627)	(138)
Other – net	62	700	456
Changes in operating assets and liabilities:
Accounts receivable – net	29,710	9,062	(37,579)
Other current assets	8,960	(3,355)	18,241
Accounts payable, accrued payroll and other liabilities	24,516	(13,197)	20,490
Unexpired subscriptions	16,927	4,375	8,990
Net cash provided by operating activities	297,933	189,898	157,117
Cash flows from investing activities
Purchases of marketable securities	(632,364)	(572,337)	(470,493)
Maturities/disposals of marketable securities	491,128	707,632	434,012
Business acquisitions	(33,085)	0	0
Proceeds from investments	6,841	85	12,447
Capital expenditures	(34,451)	(45,441)	(77,487)
Other - net	2,851	3,273	426
Net cash (used) in/provided by investing activities	(199,080)	93,212	(101,095)
Cash flows from financing activities
Repayment of debt and capital lease obligations	0	(252,559)	(552)
Dividends paid	(38,437)	(31,604)	(26,418)
Payments	(862)	0	0
Stock issuances	6,071	4,520	41,288
Share-based compensation tax withholding	(11,745)	(15,648)	(10,494)
Net cash (used) in/provided by financing activities	(44,973)	(295,291)	3,824
Net increase/(decrease) in cash, cash equivalents and restricted cash	53,880	(12,181)	59,846
Effect of exchange rate changes on cash, cash equivalents and restricted cash	566	(100)	(983)
Cash, cash equivalents and restricted cash at the beginning of the year	247,518	259,799	200,936
Cash, cash equivalents and restricted cash at the end of the year	301,964	247,518	259,799
Cash payments
Interest, net of capitalized interest	508	28,049	28,133
Income tax payments/(refunds) – net	$ 24,382	$ 30,407	$ (1,070)