Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 356,293	$ 383,990
Short-term investments	1,092,148	897,361
Accounts receivable, less allowances for doubtful accounts and sales returns of $7,616 and $8,584 at September 29, 2012 and December 31, 2011, respectively	362,371	367,085
Inventories	246,994	212,864
Other current assets	79,692	80,804
Total current assets	2,137,498	1,942,104
Property, plant and equipment, net	261,115	237,095
Intangible assets, net	212,870	191,992
Goodwill	316,269	297,071
Other assets	69,388	54,972
Total assets	2,997,140	2,723,234
Current liabilities:
Notes payable and debt	447,703	290,832
Accounts payable	60,258	55,317
Accrued employee compensation	26,964	49,949
Deferred revenue and customer advances	128,072	109,922
Accrued income taxes	20,711	9,449
Accrued warranty	12,885	13,258
Other current liabilities	70,969	73,136
Total current liabilities	767,562	601,863
Long-term liabilities:
Long-term debt	700,000	700,000
Long-term portion of retirement benefits	96,201	92,970
Long-term income tax liability	70,343	72,613
Other long-term liabilities	33,155	29,210
Total long-term liabilities	899,699	894,793
Total liabilities	1,667,261	1,496,656
Commitments and contingencies (Notes 5, 6 and 10)
Stockholders' equity:
Preferred stock, par value $0.01 per share, 5,000 shares authorized, none issued at September 29, 2012 and December 31, 2011	0	0
Common stock, par value $0.01 per share, 400,000 shares authorized, 153,512 and 152,757 shares issued, 86,926 and 88,996 shares outstanding at September 29, 2012 and December 31, 2011, respectively	1,535	1,528
Additional paid-in capital	1,136,473	1,089,959
Retained earnings	3,336,946	3,051,447
Treasury stock, at cost, 66,586 and 63,761 shares at September 29, 2012 and December 31, 2011, respectively	(3,115,583)	(2,880,301)
Accumulated other comprehensive loss	(29,492)	(36,055)
Total stockholders' equity	1,329,879	1,226,578
Total liabilities and stockholders' equity	$ 2,997,140	$ 2,723,234