Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	6 Months Ended	12 Months Ended
	Jul. 02, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 344,914	$ 308,498
Short-term investments	776,763	637,921
Accounts receivable, less allowances for doubtful accounts and sales returns of $7,878 and $6,196 at July 2, 2011 and December 31, 2010, respectively	365,331	358,237
Inventories	243,180	204,300
Other current assets	69,820	77,685
Total current assets	1,800,008	1,586,641
Property, plant and equipment, net	218,637	215,060
Intangible assets, net	195,074	181,316
Goodwill	294,020	291,657
Other assets	64,117	52,996
Total assets	2,571,856	2,327,670
Current liabilities:
Notes payable and debt	136,176	66,055
Accounts payable	67,967	64,406
Accrued employee compensation	32,332	52,831
Deferred revenue and customer advances	142,958	106,445
Accrued income taxes	8,440	11,909
Accrued warranty	12,299	11,272
Other current liabilities	67,125	72,932
Total current liabilities	467,297	385,850
Long-term liabilities:
Long-term debt	700,000	700,000
Long-term portion of retirement benefits	76,431	72,624
Long-term income tax liability	77,594	77,764
Other long-term liabilities	25,000	22,635
Total long-term liabilities	879,025	873,023
Total liabilities	1,346,322	1,258,873
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 July 2, 2011 and December 31, 2010	0	0
Common stock, par value $0.01 per share, 400,000 shares authorized, 152,343 and 151,054 shares issued, 91,369 and 91,848 shares outstanding at July 2, 2011 and December 31, 2010, respectively	1,523	1,511
Additional paid-in capital	1,041,759	970,068
Retained earnings	2,813,043	2,618,479
Treasury stock, at cost, 60,974 and 59,206 shares at July 2, 2011 and December 31, 2010, respectively	(2,663,286)	(2,509,466)
Accumulated other comprehensive income (loss)	32,495	(11,795)
Total stockholders' equity	1,225,534	1,068,797
Total liabilities and stockholders' equity	$ 2,571,856	$ 2,327,670