Consolidated Balance Sheets (Unaudited) (USD $)	Oct. 01, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 423,926,000	$ 308,498,000
Short-term investments	770,291,000	637,921,000
Accounts receivable, less allowances for doubtful accounts and sales returns of $7,009 and $6,196 at October 1, 2011 and December 31, 2010, respectively	354,445,000	358,237,000
Inventories	246,258,000	204,300,000
Other current assets	68,439,000	77,685,000
Total current assets	1,863,359,000	1,586,641,000
Property, plant and equipment, net	221,059,000	215,060,000
Intangible assets, net	196,305,000	181,316,000
Goodwill	298,297,000	291,657,000
Other assets	60,595,000	52,996,000
Total assets	2,639,615,000	2,327,670,000
Current liabilities:
Notes payable and debt	271,578,000	66,055,000
Accounts payable	64,393,000	64,406,000
Accrued employee compensation	39,209,000	52,831,000
Deferred revenue and customer advances	129,653,000	106,445,000
Accrued income taxes	25,959,000	11,909,000
Accrued warranty	12,496,000	11,272,000
Other current liabilities	62,291,000	72,932,000
Total current liabilities	605,579,000	385,850,000
Long-term liabilities:
Long-term debt	700,000,000	700,000,000
Long-term portion of retirement benefits	71,952,000	72,624,000
Long-term income tax liability	77,537,000	77,764,000
Other long-term liabilities	25,464,000	22,635,000
Total long-term liabilities	874,953,000	873,023,000
Total liabilities	1,480,532,000	1,258,873,000
Commitments and contingencies (Notes 5, 6 and 10)	0	0
Stockholders' equity:
Preferred stock, par value $0.01 per share, 5,000 shares authorized, none issued at October 1, 2011 and December 31, 2010	0	0
Common stock, par value $0.01 per share, 400,000 shares authorized, 152,403 and 151,054 shares issued, 89,584 and 91,848 shares outstanding at October 1, 2011 and December 31, 2010, respectively	1,524,000	1,511,000
Additional paid-in capital	1,051,493,000	970,068,000
Retained earnings	2,914,300,000	2,618,479,000
Treasury stock, at cost, 62,819 and 59,206 shares at October 1, 2011 and December 31, 2010, respectively	(2,807,451,000)	(2,509,466,000)
Accumulated other comprehensive loss	(783,000)	(11,795,000)
Total stockholders' equity	1,159,083,000	1,068,797,000
Total liabilities and stockholders' equity	$ 2,639,615,000	$ 2,327,670,000