Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 81,019	$ 90,983
Short-term investments	87,440	70,854
Accounts receivable, net	111,753	109,886
Inventories	65,545	70,649
Deferred income taxes	29,897	28,032
Prepaid expenses and other current assets	18,893	21,474
Total current assets	394,547	391,878
Property and equipment, net	40,439	40,469
Goodwill	212,485	212,417
Intangibles, net	80,111	87,651
Other assets	2,473	1,751
Total assets	730,055	734,166
Current liabilities:
Accounts payable	31,481	30,537
Income taxes payable	871	2,290
Deferred revenue	35,803	33,095
Accrued liabilities	39,050	46,896
Total current liabilities	107,205	112,818
Income taxes payable, long-term	47,809	47,307
Deferred income taxes, long-term	1,259	655
Other non-current liabilities	9,660	9,070
Total liabilities	165,933	169,850
Commitments and contingencies (Notes 13)
Stockholders' equity:
Preferred stock, $0.001 par value, 5,000 shares authorized; no shares issued or outstanding
Common stock, $0.001 par value, 150,000 shares authorized; 117,540 and 116,257 shares issued and outstanding at March 30, 2012 and December 31, 2011, respectively	118	116
Capital in excess of par value	2,440,158	2,433,164
Accumulated deficit	(1,875,617)	(1,868,089)
Accumulated other comprehensive loss	(537)	(875)
Total stockholders' equity	564,122	564,316
Total liabilities and stockholders' equity	$ 730,055	$ 734,166