CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 04, 2021		Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 831,149		$ 914,121
Marketable securities	478,293		522,280
Accounts receivable, less allowance for credit losses of $1,939 and $2,034 at April 4, 2021 and December 31, 2020, respectively	581,509		497,506
Inventories, net	262,474		222,189
Prepayments and other current assets	347,678		259,338
Total current assets	2,501,103		2,415,434
Property, plant and equipment, net	402,465		394,800
Operating lease right-of-use assets, net	51,516		54,569
Marketable securities	115,620		117,980
Deferred tax assets	92,365		87,913
Retirement plans assets	17,255		17,468
Other assets	8,942		9,384
Acquired intangible assets, net	92,850		100,939
Goodwill	437,601		453,859
Total assets	3,719,717	[1]	3,652,346
Current liabilities:
Accounts payable	177,473		133,663
Accrued employees' compensation and withholdings	138,238		220,321
Deferred revenue and customer advances	144,812		134,662
Other accrued liabilities	105,238		77,581
Operating lease liabilities	19,675		20,573
Income taxes payable	90,349		80,728
Current debt	11,057		33,343
Total current liabilities	686,842		700,871
Retirement plans liabilities	152,508		151,140
Long-term deferred revenue and customer advances	55,138		58,359
Long-term contingent consideration			7,227
Long-term other accrued liabilities	18,982		19,352
Deferred tax liabilities	9,606		10,821
Long-term operating lease liabilities	39,048		42,073
Long-term incomes taxes payable	74,930		74,930
Debt	356,877		376,768
Total liabilities	1,393,931		1,441,541
Commitments and contingencies (See Note Q)
Mezzanine equity:
Convertible common shares	1,233		3,787
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 166,419 and 166,123 shares issued and outstanding at April 4, 2021 and December 31, 2020, respectively	20,802		20,765
Additional paid-in capital	1,765,971		1,765,323
Accumulated other comprehensive income	8,677		33,516
Retained earnings	529,103		387,414
Total shareholders' equity	2,324,553		2,207,018
Total liabilities, convertible common shares and shareholders' equity	$ 3,719,717		$ 3,652,346

[1] Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.