Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Dec. 31, 2017	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017
Condensed Consolidated Statements of Cash Flows
Accounts receivable, net				$ (2,518)	$ 1,587
Prepaid expenses and other current assets				(6,349)	(23,506)
Deferred revenue and returns liability				(2,816)	11,039
Condensed Consolidated Statements of Income
Revenues		$ 230,243	$ 198,723	652,733	567,849
Cost of revenues		94,616	82,149	261,577	232,922
Net income		$ 27,761	$ 19,949	$ 68,446	$ 51,944
Earnings per share:
Basic (in dollars per share)		$ 0.64	$ 0.47	$ 1.59	$ 1.23
Diluted (in dollars per share)		$ 0.63	$ 0.46	$ 1.55	$ 1.20
Condensed Consolidated Balance Sheet
Prepaid expenses and other current assets		$ 46,952		$ 46,952		$ 39,120
Goodwill		396,689		396,689		288,227
Other assets, net		89,372		89,372		88,387
Deferred revenue and returns liability		25,880		25,880
Deferred income on shipments to distributors						50,115
Other current liabilities		77,821		77,821		73,359
Retained earnings		946,201		$ 946,201		$ 851,307
Performance Obligations
Product replacement warranty				1 year
ASU 2014-09 - Revenue from Contracts with Customers
Condensed Consolidated Statements of Cash Flows
Accounts receivable, net	$ 230
Prepaid expenses and other current assets	7,579
Other assets, net	(2,282)
Deferred revenue and returns liability	27,806
Deferred income on shipments to distributors	(50,115)
Other current liabilities	1,641
Retained earnings	26,195
Condensed Consolidated Statements of Income
Revenues		10,312		$ 18,475
Cost of revenues		3,483		5,466
Net income		$ 5,858		$ 10,755
Earnings per share:
Basic (in dollars per share)		$ 0.14		$ 0.25
Diluted (in dollars per share)		$ 0.13		$ 0.24
Condensed Consolidated Balance Sheet
Prepaid expenses and other current assets		$ 5,936		$ 5,936
Goodwill		(2,842)		(2,842)
Other assets, net		(4,385)		(4,385)
Deferred revenue and returns liability		25,880		25,880
Deferred income on shipments to distributors		(66,584)		(66,584)
Other current liabilities		2,710		2,710
Retained earnings	$ 26,200	$ 36,950		$ 36,950