Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2020	Jun. 29, 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	255,276	227,790
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	69,902	61,197
Amortization of debt discount and fees	512	497
Stock-based compensation	93,389	86,510
Loss on investments, net	4,036	259
Deferred income taxes	(1,609)	(8,159)
Provisions for losses (recoveries) on receivables	922	(386)
ROU asset amortization and change in operating lease liabilities	1,502	2,504
Other non-cash items	296	160
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	(2,497)	63,876
Inventories	11,020	(25,689)
Prepaid expenses and other	9,910	33,055
Other assets	(17,687)	2,547
Accounts payable and accrued liabilities	(11,141)	(34,670)
Deferred revenue	148,508	19,707
Other long-term liabilities	504	2,576
Net cash provided by operating activities	562,843	431,774
Cash flows from investing activities:
Purchases of non-marketable investments	0	(33,717)
Proceeds from the sale of non-marketable investments	0	2,952
Purchases of property, plant and equipment	(43,535)	(30,562)
Cash paid in business combinations, net of cash acquired	(195,118)	(338)
Net cash used for investing activities	(238,653)	(61,665)
Cash flows from financing activities:
Proceeds from revolving credit facility	350,000	150,000
Payment on revolving credit facility	0	(250,000)
Proceeds from issuance of common stock	43,667	32,855
Stock received for payment of employee taxes on vesting of restricted stock	(53,657)	(45,698)
Payments for repurchases of common stock	(175,036)	(156,120)
Net cash provided by (used for) financing activities	164,974	(268,963)
Effect of exchange rate changes on cash and cash equivalents	(5,188)	(1,029)
Increase in cash and cash equivalents	483,976	100,117
Cash and cash equivalents at end of period	1,189,186	633,415
Supplemental cash flow information:
Cash paid for interest	10,076	10,052
Cash paid for taxes, net	$ 20,897	$ 17,708