Balance Sheet Components (Schedule Of Accounts Receivable And Related Allowances) (Details) - USD ($) $ in Thousands	Jul. 02, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 323,291	$ 333,080
Total allowances	(18,703)	(19,241)
Accounts receivable, net	304,588	313,839
Allowance for Doubtful Accounts, Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowances	(1,256)	(1,255)
Allowance for Sales Returns [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowances	(15,029)	(13,506)
Allowance For Price Protection [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total allowances	$ (2,418)	$ (4,480)