CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 26, 2021
Cash flows from operating activities
Net income	$ 232,752	$ 173,905	$ 219,971
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	86,115	82,654	57,502
Lease termination charge	0	0	3,831
Amortization of right of use asset	9,232	9,923	9,488
Stock-based compensation expense	54,776	35,306	22,215
Multiemployer pension plan liability adjustment	(605)	14,989	0
Impairment charges	15,239	4,069	0
Gain on the sale of land	0	(34,227)	0
Gain from joint ventures	(2,477)	0	0
Gain on non-marketable equity investment	0	0	(27,156)
Change in long-term retirement benefit obligations	(29,528)	(29,049)	(19,222)
Fair market value adjustment on life insurance products	(1,648)	1,081	118
Other – net	3,932	2,739	2,902
Changes in operating assets and liabilities:
Accounts receivable – net	(24,955)	20,889	(49,216)
Other current assets	(2,154)	(23,220)	(5,289)
Accounts payable, accrued payroll and other liabilities	(7,321)	(111,216)	39,696
Unexpired subscriptions	16,827	8,588	13,950
Other noncurrent assets and liabilities	10,433	(5,744)	308
Net cash provided by operating activities	360,618	150,687	269,098
Cash flows from investing activities
Purchases of marketable securities	(286,448)	(6,648)	(763,425)
Maturities/disposals of marketable securities	142,161	484,984	593,465
Business acquisitions	0	(515,586)	0
Proceeds/(purchases) from investments	2,512	(1,832)	20,074
Capital expenditures	(22,669)	(36,961)	(34,637)
Other - net	4,754	2,482	3,716
Net cash used in investing activities	(159,690)	(73,561)	(180,807)
Long-Term Debt and Lease Obligation [Abstract]
Dividends paid	(69,464)	(56,790)	(45,337)
Payment of contingent consideration	(3,448)	(2,586)	(862)
Purchase of noncontrolling interest	(356)	0	0
Capital shares:
Stock issuances	0	3	2,454
Repurchases	(44,553)	(105,056)	0
Share-based compensation tax withholding	(14,889)	(9,877)	(11,202)
Net cash used in financing activities	(132,710)	(174,306)	(54,947)
Net increase/(decrease) in cash, cash equivalents and restricted cash	68,218	(97,180)	33,344
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(219)	(1,953)	(1,002)
Cash, cash equivalents and restricted cash at the beginning of the year	235,173	334,306	301,964
Cash, cash equivalents and restricted cash at the end of the year	303,172	235,173	334,306
Cash payments
Interest, net of capitalized interest	708	1,583	546
Income tax payments – net	$ 71,814	$ 110,161	$ 66,443