Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Cash flows from operating activities:
Net income	$ 187,169	$ 123,988
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	36,218	33,321
Amortization of debt discount and fees	264	254
Stock-based compensation	52,596	46,482
(Gain) loss on investments, net	(1,433)	3,215
Deferred income taxes	2,710	3,904
Provisions for losses (recoveries) on receivables	77	(77)
ROU asset amortization and change in operating lease liabilities	(2,136)	706
Other non-cash items	302	183
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	(45,927)	26,475
Inventories	(669)	(5,260)
Prepaid expenses and other	(3,014)	(4,964)
Other assets	6,260	(8,344)
Accounts payable and accrued liabilities	(80,769)	(84,839)
Deferred revenue	59,166	86,914
Other long-term liabilities	(2,372)	(4,239)
Net cash provided by operating activities	208,442	217,719
Cash flows from investing activities:
Purchases of property, plant and equipment	(16,968)	(22,179)
Cash paid in business combinations, net of cash acquired	(189,262)	(193,820)
Net cash used for investing activities	(206,230)	(215,999)
Cash flows from financing activities:
Proceeds from revolving credit facility	0	350,000
Proceeds from issuance of common stock	46,384	33,312
Stock received for payment of employee taxes on vesting of restricted stock	(56,385)	(37,528)
Payments for repurchases of common stock	(172,267)	(100,022)
Net cash provided by (used for) financing activities	(182,268)	245,762
Effect of exchange rate changes on cash and cash equivalents	(5,395)	(6,407)
Increase (decrease) in cash and cash equivalents	(185,451)	241,075
Cash and Cash Equivalents, at Carrying Value	742,981	946,285
Supplemental cash flow information:
Cash paid for interest	131	134
Cash paid for taxes, net	$ 10,127	$ 9,269