CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2022	Apr. 04, 2021
Cash flows from operating activities:
Net income	$ 161,928	$ 205,512
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation	22,503	23,910
Stock-based compensation	12,894	12,232
Amortization	5,233	9,822
Deferred taxes	11,288	(1,057)
Losses (gains) on investments	2,001	(2,491)
Provision for excess and obsolete inventory	1,590	2,285
Loss on convertible debt conversions	0	4,069
Contingent consideration fair value adjustments	0	(7,227)
Other	177	200
Changes in operating assets and liabilities, net of businesses acquired:
Retirement plan actuarial (gains) losses	(1,329)	(1,925)
Accounts receivable	208	(87,512)
Inventories	(9,480)	(35,870)
Prepayments and other assets	(74,305)	(86,131)
Accounts payable and other accrued expenses	(124,382)	(10,571)
Deferred revenue and customer advances	6,747	7,952
Income taxes	(7,611)	4,941
Net cash provided by operating activities	7,462	38,139
Cash flows from investing activities:
Purchases of property, plant and equipment	(43,999)	(39,250)
Purchases of marketable securities	(165,977)	(211,604)
Proceeds from maturities of marketable securities	96,682	194,228
Proceeds from sales of marketable securities	30,581	61,293
Net cash provided by (used for) investing activities	(82,713)	4,667
Cash flows from financing activities:
Issuance of common stock under stock purchase and stock option plans	16,475	17,144
Repurchase of common stock	(201,465)	(45,188)
Payments related to net settlement of employee stock compensation awards	(31,048)	(30,675)
Payments of convertible debt principal	(20,694)	(51,275)
Dividend payments	(17,895)	(16,667)
Net cash used for financing activities	(254,627)	(126,661)
Effects of exchange rate changes on cash and cash equivalents	2,282	883
Decrease in cash and cash equivalents	(327,596)	(82,972)
Cash and cash equivalents at beginning of period	1,122,199	914,121
Cash and cash equivalents at end of period	794,603	831,149
Non-cash investing activities:
Capital expenditures incurred but not yet paid	$ 2,500	$ 3,840