CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020
Cash flows from operating activities:
Net income	$ 95,612	$ 11,111
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Amortization of intangibles	37,674	41,081
Depreciation	11,044	9,834
Share-based compensation	15,107	12,983
Acquired inventory step-up amortization	253	10,172
Provision for inventory valuation	6,262	5,437
Other, net	893	546
Changes in operating assets and liabilities, net of effects of business acquired	(40,565)	(18,305)
Net cash and cash equivalents provided by operating activities	126,280	72,859
Cash flows from investing activities:
Purchases of marketable securities	(250,486)	(250,928)
Proceeds from sales of marketable securities	177,529	201,764
Cash received from convertible note receivable		2,848
Purchase of business, net of cash acquired	(26,795)
Purchases of property, plant and equipment	(11,176)	(3,391)
Net cash and cash equivalents used in investing activities	(110,928)	(49,707)
Cash flows from financing activities:
Purchase of common stock		(52,000)
Tax payments related to shares withheld for share-based compensation plans	(6,780)	(3,546)
Payment of contingent consideration for acquired business		(435)
Issuance of shares through share-based compensation plans	6,409	2,845
Net cash and cash equivalents used in financing activities	(371)	(53,136)
Effect of exchange rate changes on cash and cash equivalents	506	917
Net increase (decrease) in cash and cash equivalents	15,487	(29,067)
Cash and cash equivalents at beginning of period	136,720	130,673
Cash and cash equivalents at end of period	152,207	101,606
Supplemental disclosure of cash flow information:
Income taxes paid (net of refunds)	$ 16,524	$ 4,562