Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Current assets:
Cash and cash equivalents	$ 111,705	$ 95,800
Short-term investments	216,973	179,593
Accounts receivable, net of allowances for doubtful accounts of $784 at September 27, 2014 and $797 at December 28, 2013	71,355	72,124
Inventories	47,015	45,271
Deferred income taxes	18,064	18,878
Prepaid expenses and other current assets	39,756	47,651
Total current assets	504,868	459,317
Long-term investments	11,505	10,632
Property and equipment, net	128,433	132,445
Goodwill	228,781	228,781
Other intangible assets, net	119,854	131,593
Other assets, net	21,476	28,382
Total assets	1,014,917	991,150
Current liabilities:
Accounts payable	28,361	22,126
Current portion of long-term debt	11,250	7,500
Accrued expenses	74,732	45,975
Deferred income on shipments to distributors	37,068	30,853
Income taxes	1,319	2,693
Total current liabilities	152,730	109,147
Long-term debt	80,000	87,500
Other non-current liabilities	32,217	55,941
Total liabilities	264,947	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; 42,490 and 42,779 shares issued and outstanding at September 27, 2014 and December 28, 2013, respectively	4	4
Additional paid-in capital	31,467	48,630
Retained earnings	718,609	690,612
Accumulated other comprehensive loss	(110)	(684)
Total stockholders' equity	749,970	738,562
Total liabilities and stockholders' equity	$ 1,014,917	$ 991,150