Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011
Current assets:
Cash and cash equivalents	$ 94,964	$ 138,567
Short-term investments	212,526	227,295
Accounts receivable, net of allowances for doubtful accounts of $725 at December 31, 2011 and $772 at January 1, 2011	55,351	45,030
Inventories	34,778	39,450
Deferred income taxes	11,563	9,140
Prepaid expenses and other current assets	43,867	34,447
Total current assets	453,049	493,929
Long-term investments	17,477	17,500
Property and equipment, net	25,141	29,945
Goodwill	115,489	112,296
Other intangible assets, net	60,005	53,242
Other assets, net	34,830	20,746
Total assets	705,991	727,658
Current liabilities:
Accounts payable	26,354	24,433
Accrued expenses	30,857	25,604
Deferred income on shipments to distributors	24,962	26,127
Income taxes	665	3,692
Total current liabilities	82,838	79,856
Long-term obligations and other liabilities	24,214	22,372
Total liabilities	107,052	102,228
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; 42,068 and 43,933 shares issued and outstanding at December 31, 2011 and January 1, 2011, respectively	4	4
Additional paid-in capital	14,749	49,947
Retained earnings	586,653	579,127
Accumulated other comprehensive loss	(2,467)	(3,648)
Total stockholders' equity	598,939	625,430
Total liabilities and stockholders' equity	$ 705,991	$ 727,658