CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jul. 02, 2023
Cash flows from operating activities:
Net income	$ 250,470	$ 203,581
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation	48,927	45,231
Stock-based compensation	30,693	32,449
Losses (gains) on investments	13,090	(4,745)
Provision for excess and obsolete inventory	9,438	11,341
Amortization	9,397	9,580
Gain on sale of business	(57,486)	0
Deferred taxes	(16,830)	(13,571)
Retirement plan actuarial losses (gains)	(250)	0
Other	1,240	(92)
Changes in operating assets and liabilities
Accounts receivable	(54,211)	(2,693)
Inventories	17,102	(13,845)
Prepayments and other assets	22,190	(29,584)
Accounts payable and other liabilities	(53,009)	(24,514)
Deferred revenue and customer advances	2,739	(34,938)
Retirement plans contributions	(2,774)	(2,482)
Income taxes	2,622	(13,614)
Net cash provided by operating activities	223,348	162,104
Cash flows from investing activities:
Purchases of property, plant and equipment	(88,869)	(80,702)
Purchase of investment in a business	(524,653)	0
Purchases of marketable securities	(27,757)	(99,018)
Proceeds from the sale of a business, net of cash and cash equivalents sold	87,172	0
Proceeds from maturities of marketable securities	26,858	21,997
Proceeds from sales of marketable securities	21,289	35,577
Proceeds from insurance	873	460
Net cash used for investing activities	(505,087)	(121,686)
Cash flows from financing activities:
Repayments of borrowings on revolving credit facility	(185,000)	0
Dividend payments	(37,370)	(34,184)
Repurchase of common stock	(30,306)	(227,845)
Payments related to net settlement of employee stock compensation awards	(13,434)	(20,308)
Payments of convertible debt principal	0	(17,458)
Proceeds from borrowings on revolving credit facility	185,000	0
Issuance of common stock under stock purchase and stock option plans	21,836	16,599
Net cash used for financing activities	(59,274)	(283,196)
Effects of exchange rate changes on cash and cash equivalents	5,346	1,213
Decrease in cash and cash equivalents	(335,667)	(241,565)
Cash and cash equivalents at beginning of period	757,571	854,773
Cash and cash equivalents at end of period	421,904	613,208
Non-cash investing activities:
Capital expenditures incurred but not yet paid:	$ 3,124	$ 1,741