Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 232,626	$ 341,638
Marketable securities	462,150	586,882
Accounts receivable, less allowance for doubtful accounts of $2,454 and $2,912 at March 30, 2014 and December 31, 2013, respectively	216,524	157,642
Inventories:
Parts	77,072	84,232
Assemblies in process	15,131	15,539
Finished goods	45,231	38,168
Inventory, Net, Total	137,434	137,939
Deferred tax assets	68,780	72,478
Prepayments	131,484	136,374
Other current assets	12,249	7,324
Total current assets	1,261,247	1,440,277
Net property, plant and equipment	278,727	275,236
Marketable securities	272,068	271,078
Deferred tax assets	5,551	5,217
Other assets	10,574	14,591
Retirement plans assets	9,443	9,342
Intangible assets, net	234,020	252,291
Goodwill	361,819	361,792
Total assets	2,433,449	2,629,824
Current liabilities:
Accounts payable	70,597	62,874
Accrued employees' compensation and withholdings	58,687	95,619
Deferred revenue and customer advances	64,811	55,404
Other accrued liabilities	65,561	63,712
Dividend payable	11,648
Accrued income taxes	1,749	11,360
Current debt		186,663
Total current liabilities	273,053	475,632
Long-term deferred revenue and customer advances	13,981	13,756
Retirement plans liabilities	92,530	91,517
Deferred tax liabilities	50,532	40,686
Long-term other accrued liabilities	13,523	23,139
Total liabilities	443,619	644,730
Commitments and contingencies (Note O)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized, 194,019 shares and 191,731 shares issued and outstanding at March 30, 2014 and December 31, 2013, respectively	24,253	23,966
Additional paid-in capital	1,405,175	1,390,896
Accumulated other comprehensive income	4,890	4,000
Retained earnings	555,512	566,232
Total shareholders' equity	1,989,830	1,985,094
Total liabilities and shareholders' equity	$ 2,433,449	$ 2,629,824