Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Current assets:
Cash and cash equivalents	$ 93,290	$ 95,800
Short-term investments	235,645	179,593
Accounts receivable, net of allowances for doubtful accounts of $788 at June 28, 2014 and $797 at December 28, 2013	69,042	72,124
Inventories	45,557	45,271
Deferred income taxes	17,658	18,878
Prepaid expenses and other current assets	47,785	47,651
Total current assets	508,977	459,317
Long-term investments	10,993	10,632
Property and equipment, net	129,357	132,445
Goodwill	228,781	228,781
Other intangible assets, net	124,106	131,593
Other assets, net	22,251	28,382
Total assets	1,024,465	991,150
Current liabilities:
Accounts payable	24,745	22,126
Current portion of long-term debt	10,000	7,500
Accrued expenses	65,672	45,975
Deferred income on shipments to distributors	33,437	30,853
Income taxes	896	2,693
Total current liabilities	134,750	109,147
Long-term debt	82,500	87,500
Other non-current liabilities	29,610	55,941
Total liabilities	246,860	252,588
Commitments and contingencies
Stockholders' equity:
Preferred stock - $0.0001 par value; 10,000 shares authorized; no shares issued and outstanding
Common stock - $0.0001 par value; 250,000 shares authorized; 43,406 and 42,779 shares issued and outstanding at June 28, 2014 and December 28, 2013, respectively	4	4
Additional paid-in capital	65,199	48,630
Retained earnings	713,001	690,612
Accumulated other comprehensive loss	(599)	(684)
Total stockholders' equity	777,605	738,562
Total liabilities and stockholders' equity	$ 1,024,465	$ 991,150