CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Oct. 03, 2021	Sep. 27, 2020
Cash flows from operating activities:
Net income	$ 790,549	$ 587,815
Adjustments to reconcile net income from operations to net cash provided by operating activities:
Depreciation	67,866	58,111
Stock-based compensation	34,649	33,028
Amortization	27,626	36,577
Loss on convertible debt conversion	25,397
Provision for excess and obsolete inventory	11,775	13,116
Deferred taxes	(10,732)	(4,547)
Contingent consideration adjustment	(7,227)	(7,967)
Gains on investments	(4,750)	(3,515)
Retirement plan actuarial (gains) losses	(627)	2,589
Other	243	750
Changes in operating assets and liabilities, net of businesses acquired:
Accounts receivable	(103,299)	(222,015)
Inventories	21,943	16,998
Prepayments and other assets	(138,564)	(40,751)
Accounts payable and other liabilities	65,064	81,557
Deferred revenue and customer advances	8,699	36,589
Retirement plans contributions	(4,123)	(3,884)
Income taxes	(17,406)	24,060
Net cash provided by operating activities	767,083	608,511
Cash flows from investing activities:
Purchases of property, plant and equipment	(103,162)	(146,872)
Purchases of marketable securities	(509,470)	(488,428)
Proceeds from maturities of marketable securities	571,277	309,407
Proceeds from sales of marketable securities	209,437	32,611
Purchase of investment and acquisition of businesses	(12,000)	149
Proceeds from life insurance		546
Net cash provided by (used for) investing activities	156,082	(292,587)
Cash flows from financing activities:
Issuance of common stock under stock purchase and stock option plans	32,590	26,528
Repurchase of common stock	(406,180)	(88,465)
Payments of convertible debt principal	(301,997)
Dividend payments	(49,711)	(49,870)
Payments related to net settlement of employee stock compensation awards	(32,045)	(22,735)
Payments of contingent consideration		(8,852)
Net cash used for financing activities	(757,343)	(143,394)
Effects of exchange rate changes on cash and cash equivalents	(489)	(1,274)
Increase in cash and cash equivalents	165,333	171,256
Cash and cash equivalents at beginning of period	914,121	773,924
Cash and cash equivalents at end of period	1,079,454	945,180
Non-cash investing activities:
Capital expenditures incurred but not yet paid	$ 2,286	$ 3,119