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Condensed 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. 30, 2023 $ 49,429 $ 686,146 $ 318,558 $ (34,779) $ (69,184) $ 950,170
Net loss 0 0 (48,460) 0 0 (48,460)
Changes in cumulative translation adjustment 0 0 0 (2,947) 0 (2,947)
Adjustments related to postretirement benefits 0 0 0 (38) 0 (38)
Changes in unrealized gains and losses on investments, net of tax 0 0 0 161 0 161
Shares issued for restricted stock units vested 0 (13,045) 0 0 13,045 0
Repurchase and retirement of stock 0 (60) 0 0   (4,662)
Treasury Stock, Retired, Cost Method, Amount         (4,602)  
Common stock repurchases 0 0 0 0 (27,147) (27,147)
Share-based compensation expense 0 15,459 0 0 0 15,459
Shares issued under ESPP 78 1,924 0 0 0 2,002
Balance at Sep. 28, 2024 49,507 690,424 270,098 (37,603) (87,888) 884,538
Balance at Jun. 29, 2024 49,507 685,522 288,154 (46,953) (80,020) 896,210
Net loss 0 0 (18,056) 0 0 (18,056)
Changes in cumulative translation adjustment 0 0 0 9,476 0 9,476
Adjustments related to postretirement benefits 0 0 0 (389) 0 (389)
Changes in unrealized gains and losses on investments, net of tax 0 0 0 263 0 263
Shares issued for restricted stock units vested 0 (369) 0 0 369 0
Repurchase and retirement of stock 0 23 0 0   (91)
Treasury Stock, Retired, Cost Method, Amount         (114)  
Common stock repurchases 0 0 0 0 (8,123) (8,123)
Share-based compensation expense 0 5,248 0 0 0 5,248
Balance at Sep. 28, 2024 49,507 690,424 270,098 (37,603) (87,888) 884,538
Balance at Dec. 28, 2024 49,601 697,489 248,740 (51,155) (87,784) 856,891 [1]
Net loss 0 0 (51,785) 0 0 (51,785)
Changes in cumulative translation adjustment 0 0 0 18,933 0 18,933
Adjustments related to postretirement benefits 0 0 0 (1,392) 0 (1,392)
Changes in unrealized gains and losses on investments, net of tax 0 0 0 39 0 39
Shares issued for restricted stock units vested 0 (12,555) 0 0 12,555 0
Repurchase and retirement of stock 0 1,846 0 0   (2,531)
Treasury Stock, Retired, Cost Method, Amount         (4,377)  
Common stock repurchases 0 0 0 0 (8,587) (8,587)
Share-based compensation expense 0 17,564 0 0 0 17,564
Shares issued under ESPP 144 1,813 0 0 0 1,957
Balance at Sep. 27, 2025 49,745 706,157 196,955 (33,575) (88,193) 831,089
Balance at Jun. 28, 2025 49,745 700,763 201,056 (32,636) (88,385) 830,543
Net loss 0 0 (4,101) 0 0 (4,101)
Changes in cumulative translation adjustment 0 0 0 (622) 0 (622)
Adjustments related to postretirement benefits 0 0 0 (355) 0 (355)
Changes in unrealized gains and losses on investments, net of tax 0 0 0 38 0 38
Shares issued for restricted stock units vested 0 (287) 0 0 287 0
Repurchase and retirement of stock   22 0 0   (56)
Treasury Stock, Retired, Cost Method, Amount         (78)  
Common stock repurchases 0 0 0 0 (17) (17)
Share-based compensation expense 0 5,659 0 0 0 5,659
Balance at Sep. 27, 2025 $ 49,745 $ 706,157 $ 196,955 $ (33,575) $ (88,193) $ 831,089
[1] Derived from December 28, 2024, audited financial statements