Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common [Member]	Total
Balance at Dec. 25, 2021	$ 48,756	$ 674,777	$ 193,555	$ (27,262)	$ (7,324)	$ 882,502
Net income (loss)	0	0	21,569	0	0	21,569
Changes in cumulative translation adjustment	0	0	0	(8,903)	0	(8,903)
Adjustments related to postretirement benefits	0	0	0	(61)	0	(61)
Changes in unrealized gains and losses on investments, net of tax	0	0	0	(348)	0	(348)
Shares issued for restricted stock units vested	426	(426)	0	0	0	0
Repurchase and retirement of stock	(157)	(4,739)	0	0	0	(4,896)
Common stock repurchases	0	0	0	0	(6,388)	(6,388)
Share-based compensation expense	0	3,422	0	0	0	3,422
Balance at Mar. 26, 2022	49,025	673,034	215,124	(36,574)	(13,712)	886,897
Balance at Dec. 31, 2022	49,276	687,218	290,402	(40,012)	(58,043)	928,841	[1]
Net income (loss)	0	0	15,685	0	0	15,685
Changes in cumulative translation adjustment	0	0	0	2,701	0	2,701
Adjustments related to postretirement benefits	0	0	0	29	0	29
Changes in unrealized gains and losses on investments, net of tax	0	0	0	273	0	273
Shares issued for restricted stock units vested	7	(18,067)	0	0	18,060	0
Repurchase and retirement of stock	0	(1,861)	0	0	(7,322)	(9,183)
Common stock repurchases	0	0	0	0	(3,481)	(3,481)
Share-based compensation expense	0	3,914	0	0	0	3,914
Balance at Apr. 01, 2023	$ 49,283	$ 671,204	$ 306,087	$ (37,009)	$ (50,786)	$ 938,779

[1] Derived from December 31, 2022 audited financial statements