CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Oct. 04, 2015	Sep. 28, 2014
Cash flows from operating activities:
Net income	$ 207,118	$ 185,083
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	52,531	52,832
Amortization	52,159	62,122
Stock-based compensation	23,080	31,873
Provision for excess and obsolete inventory	18,939	21,505
Non-cash charge for the sale of inventories revalued at the date of acquisition	1,567
Tax benefit related to employee stock compensation awards	(3,213)	(1,726)
Contingent consideration adjustment	(2,600)	(630)
Gain from the sale of an equity investment	(5,406)
Deferred taxes	(13,973)	(8,747)
Other	2,523	2,110
Changes in operating assets and liabilities, net of business acquired:
Accounts receivable	(91,117)	(163,670)
Inventories	33,376	38,267
Prepayments and other assets	15,529	47,784
Accounts payable and other accrued expenses	52,663	29,109
Deferred revenue and customer advances	6,751	14,266
Retirement plans contributions	(2,998)	(3,281)
Accrued income taxes	25,677	10,208
Net cash provided by operating activities	372,606	317,105
Cash flows from investing activities:
Purchases of property, plant and equipment	(66,727)	(146,352)
Acquisition of business, net of cash acquired	(282,741)
Purchases of available-for-sale marketable securities	(957,606)	(844,056)
Proceeds from sales of available-for-sale marketable securities	843,734	236,060
Proceeds from maturities of available-for-sale marketable securities	330,363	495,565
Proceeds from the sale of an equity investment	5,406
Proceeds from life insurance	1,098	4,391
Net cash used for investing activities	(126,473)	(254,392)
Cash flows from financing activities:
Issuance of common stock under employee stock purchase and stock option plans	18,145	21,030
Tax benefit related to employee stock compensation awards	3,213	1,726
Repurchase of common stock	(226,843)
Dividend payments	(38,434)	(24,428)
Payment of revolving credit facility costs	(2,253)
Payments of long-term debt		(190,975)
Net cash used for financing activities	(246,172)	(192,647)
Decrease in cash and cash equivalents	(39)	(129,934)
Cash and cash equivalents at beginning of period	294,256	341,638
Cash and cash equivalents at end of period	$ 294,217	$ 211,704