CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024
Cash flows from operating activities:
Net income	$ 177,269	$ 250,470
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation	52,835	48,927
Stock-based compensation	32,031	30,693
Equity in net earnings of affiliate	11,511	0
Losses (gains) on investments	(1,078)	13,090
Provision for excess and obsolete inventory	12,347	9,438
Amortization	8,856	9,397
Gain on sale of business	0	(57,486)
Deferred taxes	(14,998)	(16,830)
Retirement plan actuarial losses (gains)	127	(250)
Other	3,168	1,240
Changes in operating assets and liabilities, net of businesses acquired:
Accounts receivable	49,496	(54,211)
Inventories	(23,707)	17,102
Prepayments and other assets	30,879	22,190
Accounts payable and other liabilities	17,135	(53,009)
Deferred revenue and customer advances	13,056	2,739
Retirement plans contributions	(5,576)	(2,774)
Income taxes	(19,625)	2,622
Net cash provided by operating activities	343,726	223,348
Cash flows from investing activities:
Purchases of property, plant and equipment	(114,429)	(88,869)
Acquisition of businesses, net of cash acquired	(144,380)	0
Purchase of investment in a business	(5,368)	(524,653)
Purchases of marketable securities	(17,150)	(27,757)
Proceeds from the sale of a business, net of cash and cash equivalents sold	0	87,172
Proceeds from maturities of marketable securities	32,603	26,858
Proceeds from sales of marketable securities	8,487	21,289
Proceeds from insurance	0	873
Net cash used for investing activities	(240,237)	(505,087)
Cash flows from financing activities:
Repayments of borrowings on revolving credit facility	0	(185,000)
Dividend payments	(38,584)	(37,370)
Repurchase of common stock	(274,873)	(30,306)
Payments related to net settlement of employee stock compensation awards	(14,954)	(13,434)
Proceeds from borrowings on revolving credit facility	0	185,000
Issuance of common stock under stock purchase and stock option plans	14,792	21,836
Net cash used for financing activities	(313,619)	(59,274)
Effects of exchange rate changes on cash and cash equivalents	(3,972)	5,346
Decrease in cash and cash equivalents	(214,102)	(335,667)
Cash and cash equivalents at beginning of period	553,354	757,571
Cash and cash equivalents at end of period	339,252	421,904
Non-cash investing activities:
Capital expenditures incurred but not yet paid:	$ 4,722	$ 3,124