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	75,219	0	0	75,219
Changes in cumulative translation adjustment	0	0	0	(43,960)	0	(43,960)
Adjustments related to postretirement benefits	0	0	0	(302)	0	(302)
Changes in unrealized gains and losses on investments, net of tax	0	0	0	(882)	0	(882)
Shares issued for restricted stock units vested	521	(521)	0	0	0	0
Repurchase and retirement of stock	(180)	(5,467)	0	0		(5,647)
Repurchase and retirement of stock					0
Common stock repurchases	0	0	0	0	(38,078)	(38,078)
Share-based compensation expense	0	11,095	0	0	0	11,095
Shares issued under ESPP	77	1,669	0	0	0	1,746
Exercise of stock options	13	105	0	0	0	118
Balance at Sep. 24, 2022	49,187	681,658	268,774	(72,406)	(45,402)	881,811
Balance at Jun. 25, 2022	49,152	678,495	243,892	(49,385)	(27,702)	894,452
Net income (loss)	0	0	24,882	0	0	24,882
Changes in cumulative translation adjustment	0	0	0	(22,520)	0	(22,520)
Adjustments related to postretirement benefits	0	0	0	(129)	0	(129)
Changes in unrealized gains and losses on investments, net of tax	0	0	0	(372)	0	(372)
Shares issued for restricted stock units vested	55	(55)	0	0	0	0
Repurchase and retirement of stock	(20)	(522)	0	0		(542)
Repurchase and retirement of stock					0
Common stock repurchases	0	0	0	0	(17,700)	(17,700)
Share-based compensation expense	0	3,740	0	0	0	3,740
Balance at Sep. 24, 2022	49,187	681,658	268,774	(72,406)	(45,402)	881,811
Balance at Dec. 31, 2022	49,276	687,218	290,402	(40,012)	(58,043)	928,841	[1]
Net income (loss)	0	0	30,184	0	0	30,184
Changes in cumulative translation adjustment	0	0	0	(7,377)	0	(7,377)
Adjustments related to postretirement benefits	0	0	0	63	0	63
Changes in unrealized gains and losses on investments, net of tax	0	0	0	361	0	361
Shares issued for restricted stock units vested	7	(20,083)	0	0	20,076	0
Repurchase and retirement of stock	0	(1,918)	0	0		(9,566)
Repurchase and retirement of stock					(7,648)
Common stock repurchases	0	0	0	0	(10,854)	(10,854)
Share-based compensation expense	0	12,680	0	0	0	12,680
Shares issued under ESPP	67	1,837	0	0	0	1,904
Balance at Sep. 30, 2023	49,350	679,734	320,586	(46,965)	(56,469)	946,236
Balance at Jul. 01, 2023	49,350	676,309	316,671	(36,559)	(52,378)	953,393
Net income (loss)	0	0	3,915	0	0	3,915
Changes in cumulative translation adjustment	0	0	0	(10,436)	0	(10,436)
Adjustments related to postretirement benefits	0	0	0	(123)	0	(123)
Changes in unrealized gains and losses on investments, net of tax	0	0	0	153	0	153
Shares issued for restricted stock units vested	0	(858)	0	0	858	0
Repurchase and retirement of stock	0	(51)	0	0		(326)
Repurchase and retirement of stock					(275)
Common stock repurchases	0	0	0	0	(4,674)	(4,674)
Share-based compensation expense	0	4,334	0	0	0	4,334
Balance at Sep. 30, 2023	$ 49,350	$ 679,734	$ 320,586	$ (46,965)	$ (56,469)	$ 946,236

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