Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 431,001	$ 481,035
Investments	1,268,106	1,057,990
Accounts receivable, less allowances for doubtful accounts and sales returns of $6,567 and $8,240 at September 28, 2013 and December 31, 2012, respectively	373,844	404,556
Inventories	256,980	229,565
Other current assets	99,151	84,580
Total current assets	2,429,082	2,257,726
Property, plant and equipment, net	313,667	273,279
Intangible assets, net	230,774	220,145
Goodwill	340,393	316,834
Other assets	111,403	100,166
Total assets	3,425,319	3,168,150
Current liabilities:
Notes payable and debt	133,761	132,781
Accounts payable	62,754	54,724
Accrued employee compensation	30,225	31,910
Deferred revenue and customer advances	134,537	121,470
Accrued income taxes	39,716	60,888
Accrued warranty	11,964	12,353
Other current liabilities	79,947	90,116
Total current liabilities	492,904	504,242
Long-term liabilities:
Long-term debt	1,160,000	1,045,000
Long-term portion of retirement benefits	102,151	101,225
Long-term income tax liability	19,049	24,772
Other long-term liabilities	32,581	25,554
Total long-term liabilities	1,313,781	1,196,551
Total liabilities	1,806,685	1,700,793
Commitments and contingencies (Notes 6, 7, 8 and 11)
Stockholders' equity:
Preferred stock, par value $0.01 per share, 5,000 shares authorized, none issued at September 28, 2013 and December 31, 2012	0	0
Common stock, par value $0.01 per share, 400,000 shares authorized, 154,603 and 153,696 shares issued, 84,931 and 86,390 shares outstanding at September 28, 2013 and December 31, 2012, respectively	1,546	1,537
Additional paid-in capital	1,223,328	1,155,504
Retained earnings	3,821,311	3,512,890
Treasury stock, at cost, 69,672 and 67,306 shares at September 28, 2013 and December 31, 2012, respectively	(3,402,377)	(3,176,179)
Accumulated other comprehensive loss	(25,174)	(26,395)
Total stockholders' equity	1,618,634	1,467,357
Total liabilities and stockholders' equity	$ 3,425,319	$ 3,168,150