Consolidated Statements of Stockholders' Equity - 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
Common stock repurchases	0	0	0	0	(50,719)	(50,719)
Net income (loss)	0	0	96,847	0	0	96,847
Changes in cumulative translation adjustment	0	0	0	(17,950)	0	(17,950)
Adjustments related to postretirement benefits	0	0	0	5,894	0	5,894
Changes in unrealized gains and losses on investments, net of tax	0	0	0	(694)	0	(694)
Exercise of stock options	12	105	0	0	0	117
Shares issued under ESPP	161	3,470	0	0	0	3,631
Shares issued for restricted stock units vested	529	(529)	0	0	0	0
Repurchase and retirement of stock	(182)	(5,523)	0	0	0	(5,705)
Share-based compensation expense	0	14,918	0	0	0	14,918
Balance at Dec. 31, 2022	49,276	687,218	290,402	(40,012)	(58,043)	928,841
Common stock repurchases	0	0	0	0	(23,641)	(23,641)
Net income (loss)	0	0	28,156	0	0	28,156
Changes in cumulative translation adjustment	0	0	0	6,815	0	6,815
Adjustments related to postretirement benefits	0	0	0	(2,375)	0	(2,375)
Changes in unrealized gains and losses on investments, net of tax	0	0	0	793	0	793
Shares issued under ESPP	147	3,785	0	0	0	3,932
Shares issued for restricted stock units vested	6	(20,174)	0	0	20,168	0
Repurchase and retirement of stock	0	(1,920)	0	0		(9,588)
Share-based compensation expense	0	17,237	0	0	0	17,237
Repurchase and retirement of stock					(7,668)
Balance at Dec. 30, 2023	49,429	686,146	318,558	(34,779)	(69,184)	950,170
Common stock repurchases	0	0	0	0	(27,123)	(27,123)
Net income (loss)	0	0	(69,818)	0	0	(69,818)
Changes in cumulative translation adjustment	0	0	0	(16,839)	0	(16,839)
Adjustments related to postretirement benefits	0	0	0	518	0	518
Changes in unrealized gains and losses on investments, net of tax	0	0	0	(55)	0	(55)
Shares issued under ESPP	172	3,814	0	0	0	3,986
Shares issued for restricted stock units vested	0	(13,154)	0	0	13,154	0
Repurchase and retirement of stock	0	(57)	0	0		(4,688)
Share-based compensation expense	0	20,740	0	0	0	20,740
Repurchase and retirement of stock					(4,631)
Balance at Dec. 28, 2024	$ 49,601	$ 697,489	$ 248,740	$ (51,155)	$ (87,784)	$ 856,891