Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2020	Sep. 28, 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	416,906	329,304
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	107,019	91,400
Amortization of debt discount and fees	770	747
Stock-based compensation	138,723	134,789
Loss on investments, net	5,118	2,655
Deferred income taxes	(18,966)	(10,938)
Provisions for losses (recoveries) on receivables	1,087	(358)
ROU asset amortization and change in operating lease liabilities	2,064	4,285
Other non-cash items	410	197
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	9,945	26,553
Inventories	6,376	(43,781)
Prepaid expenses and other	22,769	38,703
Other assets	(21,287)	3,554
Accounts payable and accrued liabilities	(30,455)	(4,001)
Deferred revenue	124,491	(6,968)
Other long-term liabilities	4,430	4,163
Net cash provided by operating activities	769,400	570,304
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	(63,745)	(47,527)
Cash paid in business combinations, net of cash acquired	(197,562)	(338)
Net cash used for investing activities	(261,307)	(78,630)
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	71,451	49,127
Stock received for payment of employee taxes on vesting of restricted stock	(85,515)	(75,016)
Payments for repurchases of common stock	(250,047)	(231,131)
Net cash provided by (used for) financing activities	85,889	(357,020)
Effect of exchange rate changes on cash and cash equivalents	7,372	(12,736)
Increase in cash and cash equivalents	601,354	121,918
Cash and cash equivalents at end of period	1,306,564	655,216
Supplemental cash flow information:
Cash paid for interest	10,982	10,052
Cash paid for taxes, net	$ 44,679	$ 25,439