Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 29, 2014	Mar. 30, 2013
Cash flows from operating activities:
Net income	$ 70,302	$ 121,059
Adjustments to reconcile net income to net cash provided by operating activities:
Provisions for doubtful accounts on accounts receivable	1,059	463
Provisions on inventory	1,139	1,340
Stock-based compensation	8,129	7,431
Deferred income taxes	(2,218)	(991)
Depreciation	8,819	8,487
Amortization of intangibles	11,523	9,775
Change in operating assets and liabilities, net of acquisitions:
Decrease in accounts receivable	30,147	16,499
Increase in inventories	(24,163)	(12,840)
Increase in other current assets	(8,008)	(506)
Increase in other assets	(7,169)	(6,181)
Decrease in accounts payable and other current liabilities	(11,491)	(45,340)
Increase in deferred revenue and customer advances	34,356	26,825
Increase in other liabilities	3,330	1,777
Net cash provided by operating activities	115,755	127,798
Cash flows from investing activities:
Additions to property, plant, equipment and software capitalization	(21,395)	(30,637)
Business acquisitions, net of cash acquired	(3,615)	0
Purchase of investments	(607,028)	(767,541)
Maturities and sales of investments	512,089	707,725
Net cash used in investing activities	(119,949)	(90,453)
Cash flows from financing activities:
Proceeds from debt issuances	10,053	65,632
Payments on debt	(1,295)	(10,181)
Proceeds from stock plans	35,322	7,478
Purchase of treasury shares	(92,572)	(101,367)
Excess tax benefit related to stock option plans	8,507	3,163
(Payments for) proceeds from derivative contracts	(314)	694
Net cash used in financing activities	(40,299)	(34,581)
Effect of exchange rate changes on cash and cash equivalents	(921)	(11,751)
Decrease in cash and cash equivalents	(45,414)	(8,987)
Cash and cash equivalents at beginning of period	440,796	481,035
Cash and cash equivalents at end of period	$ 395,382	$ 472,048

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.