Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of period	$ 705,210	$ 533,298
Cash flows from operating activities:
Net income	123,988	120,555
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	33,321	29,740
Amortization of debt discount and fees	254	247
Stock-based compensation	46,482	42,253
(Gain) loss on investments, net	3,215	(2,646)
Deferred income taxes	3,904	(4,966)
Recoveries on receivables	(77)	(183)
ROU asset amortization and change in operating lease liabilities	706	1,341
Other non-cash items	183	122
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	26,475	35,681
Inventories	(5,260)	(10,618)
Prepaid expenses and other	(4,964)	15,618
Other assets	(8,344)	4,559
Accounts payable and accrued liabilities	(84,839)	(41,261)
Deferred revenue	86,914	(4,451)
Other long-term liabilities	(4,239)	(577)
Net cash provided by operating activities	217,719	185,414
Cash flows from investing activities:
Purchases of non-marketable investments	0	(33,664)
Proceeds from the sale of non-marketable investments	0	2,952
Purchases of property, plant and equipment	(22,179)	(15,275)
Cash paid in business combinations, net of cash acquired	(193,820)	0
Net cash used for investing activities	(215,999)	(45,987)
Cash flows from financing activities:
Proceeds from revolving credit facility	350,000	50,000
Payment on revolving credit facility	0	(100,000)
Proceeds from issuance of common stock	33,312	29,858
Stock received for payment of employee taxes on vesting of restricted stock	(37,528)	(32,822)
Payments for repurchases of common stock	(100,022)	(81,114)
Net cash provided by (used for) financing activities	245,762	(134,078)
Effect of exchange rate changes on cash and cash equivalents	(6,407)	251
Increase in cash and cash equivalents	241,075	5,600
Cash and cash equivalents at end of period	946,285	538,898
Supplemental cash flow information:
Cash paid for interest	134	1,324
Cash paid for taxes, net	$ 9,269	$ 6,892