Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Cash flows from operating activities:
Net income	$ 28,156	$ 96,847	$ 167,325
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on business divestitures	0	0	(70,815)
Interest capitalized associated with cloud computing implementation	0	(199)	(91)
Net accretion on investments	(1,364)	(859)	0
Loss on extinguishment of debt	369	312	3,411
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	0	0	100
Depreciation and amortization	49,744	46,016	48,568
Share-based compensation expense	17,237	14,918	13,792
Inventory related charges	5,619	6,725	6,523
Amortization of debt discounts and issuance costs	146	315	643
Accrued retiree benefits	(540)	(1,589)	(500)
Deferred income taxes	(4,774)	(3,504)	953
Changes in other assets	(13,286)	(3,230)	(1,652)
Amortization of cloud-based software implementation costs	2,800	2,060	1,644
(Gain) loss from sale of property, plant and equipment	(4)	(203)	1
Changes in other accrued liabilities	(702)	(943)	(416)
Operating lease right-of-use assets	7,656	5,139	6,746
Changes in current assets and liabilities, excluding effects from divestitures:
Customer advances	(2,309)	(184)	(4,090)
Accounts receivable	61,899	12,451	(59,123)
Inventories	12,839	(18,508)	(35,864)
Accrued compensation, warranty and other liabilities	(14,897)	(4,007)	225
Accounts payable	(21,356)	(33,130)	17,316
Deferred profit	(4,447)	(5,014)	4,732
Other current assets	10,920	(16,202)	1,709
Income taxes payable	(24,782)	20,908	3,444
Current and long-term operating lease liabilities	(7,454)	(5,258)	(6,666)
Net cash provided by operating activities	101,470	112,861	97,915
Cash flows from investing activities:
Purchases of property, plant and equipment	(16,053)	(14,770)	(12,000)
Net cash received from sale of land, facility and assets	216	349	157
Purchases of short-term investments	(97,290)	(208,856)	(204,699)
Sales and maturities of short-term investments	152,649	155,406	135,549
Cash received from disposition of business, net of cash paid	0	0	120,886
Net cash provided by (used in) investing activities	(30,210)	(67,871)	39,893
Cash flows from financing activities:
Proceeds from revolving line of credit and construction loans	0	0	1,376
Repayments of long-term debt	(38,788)	(38,226)	(206,069)
Net issuance (repurchases) of stock, including awards settled in cash	(5,656)	(1,957)	(4,390)
Payments on current and long-term finance lease liabilities	(52)	(167)	(186)
Acquisition of treasury stock	(23,641)	(50,719)	(7,324)
Proceeds received from issuance of common stock, net of fees	0	0	223,119
Net cash provided by (used in) financing activities	(68,137)	(91,069)	6,526
Effect of exchange rate changes on cash and cash equivalents	60	(1,781)	(3,491)
Net increase (decrease) in cash and cash equivalents	3,183	(47,860)	140,843
Cash and cash equivalents at beginning of year	242,341	290,201	149,358
Cash and cash equivalents at end of year	245,524	242,341	290,201
Supplemental disclosure of cash flow information:
Cash paid for income taxes	44,276	23,123	22,717
Cash paid for interest	3,424	3,443	6,253
Property, plant and equipment purchases included in accounts payable	124	152	624
Inventory capitalized as capital assets	1,215	2,529	1,635
MCT Worldwide, LLC [Member]
Cash flows from investing activities:
Payment for purchase of business, net of cash received	(26,331)	0	0
Equiptest Engineering Pte Ltd. [Member]
Cash flows from investing activities:
Payment for purchase of business, net of cash received	$ (43,401)	$ 0	$ 0