Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2026	Mar. 29, 2025
Cash flows from operating activities:
Net income (loss)	$ (12,068)	$ (30,804)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net accretion on investments	(979)	(243)
(Gain) loss from sale of property, plant and equipment	0	(1)
Depreciation and amortization	10,423	13,084
Share-based compensation expense	6,276	6,230
Inventory related charges	2,296	1,803
Deferred income taxes	1,683	(889)
Changes in accrued retiree medical benefits	(339)	(49)
Changes in other accrued liabilities	(224)	(117)
Changes in other assets	(135)	(307)
Amortization of cloud-based software implementation costs	709	709
Change in fair value of contingent consideration liability	0	(1,700)
Amortization of debt discounts and issuance costs	413	0
Operating lease right-of-use assets	1,174	1,241
Changes in current assets and liabilities:
Customer advances	2,561	(392)
Accounts receivable, net	4,901	(775)
Inventories	(4,805)	687
Other current assets	(5,065)	(4,625)
Accounts payable	7,210	1,692
Deferred profit	(980)	1,930
Income taxes payable	163	1,054
Accrued compensation, warranty and other liabilities	(2,466)	2,582
Current and long-term operating lease liabilities	(435)	(1,292)
Net cash provided by operating activities	10,313	(10,182)
Cash flows from investing activities:
Purchases of short-term investments	(68,601)	(16,895)
Sales and maturities of short-term investments	48,211	23,902
Settlement of net investment hedge	35	4,888
Purchases of property, plant and equipment	(2,026)	(10,964)
Cash received from sale of property, plant and equipment	2	2
Net cash provided by (used in) investing activities	(22,379)	(34,002)
Cash flows from financing activities:
Payments on current and long-term finance lease liabilities	0	(3)
Repurchases of common stock, net	(4,577)	(2,150)
Proceeds from revolving line of credit, revolving credit facility and convertible notes	0	8,730
Repayments of long-term debt	(375)	(279)
Acquisition of treasury stock	0	(8,449)
Net cash provided by (used in) financing activities	(4,952)	(2,151)
Effect of exchange rate changes on cash and cash equivalents
Effect of exchange rate changes on cash and cash equivalents	906	(8,196)
Net decrease in cash and cash equivalents	(16,112)	(54,531)
Cash and cash equivalents at beginning of year	227,053	206,407
Cash and cash equivalents at end of year	210,941	151,876
Supplemental disclosure of cash flow information:Cash Flow Information [Abstract]
Cash paid for income taxes, net of refunds	3,556	6,466
Inventory capitalized as capital assets	542	464
Property, plant and equipment purchases included in accounts payable	1,144	937
Cash paid for interest	1,384	197
Tignis, Inc [Member]
Cash flows from investing activities:
Payment for purchase of business, net of cash received	$ 0	$ (34,935)