Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	6 Months Ended
Jul. 03, 2011	Jul. 04, 2010
Cash flows from operating activities:
Net income	$ 183,930	$ 172,249
Less: income from discontinued operations	1,545	620
Less: gain on disposal of discontinued operations	24,371
Income from continuing operations	158,014	171,629
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation	25,645	26,403
Amortization	25,291	23,105
Stock-based compensation	14,682	15,141
Provision for excess and obsolete inventory	6,343	1,454
Tax benefit related to stock options and restricted stock units	(3,717)
Other	1,424	1,659
Changes in operating assets and liabilities, net of businesses sold:
Accounts receivable	(39,067)	(123,184)
Inventories	(15,006)	24,231
Prepayments and other assets	(10,348)	15,544
Deferred revenue and customer advances	(28,339)	(62,901)
Accounts payable and accrued expenses	(9,279)	52,377
Retirement plan contributions	(5,241)	(24,677)
Accrued income taxes	5,406	11,346
Net cash provided by operating activities from continuing operations	125,808	132,127
Net cash (used for) provided by operating activities from discontinued operations	(4,225)	1,850
Net cash provided by operating activities	121,583	133,977
Cash flows from investing activities:
Purchases of property, plant and equipment	(44,467)	(35,706)
Purchases of available-for-sale marketable securities	(498,541)	(223,820)
Proceeds from sales and maturities of available-for-sale marketable securities	420,477	47,267
Proceeds from sales of trading marketable securities		23,700
Proceeds from life insurance		1,091
Net cash used for investing activities from continuing operations	(122,531)	(187,468)
Net cash provided by investing activities from discontinued operations	39,062
Net cash used for investing activities	(83,469)	(187,468)
Cash flows from financing activities:
Issuance of common stock under employee stock option and stock purchase plans	17,052	41,873
Tax benefit related to stock options and restricted stock units	3,717
Payments of long-term debt	(1,222)	(1,123)
Net cash provided by financing activities	19,547	40,750
Increase (decrease) in cash and cash equivalents	57,661	(12,741)
Cash and cash equivalents at beginning of period	397,737	416,737
Cash and cash equivalents at end of period	$ 455,398	$ 403,996

Net increase (decrease) in deferred revenue and customer advances.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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The net cash from (used in) the entity's continuing operations. This element specifically EXCLUDES the cash flows derived by the entity from its discontinued operations, if any. This element is only to be used when the entity reports its cash flows attributable to discontinued operations separately from the cash flow provided by or used in operating activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary.

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The cash inflow associated with the sale of other investments not otherwise defined in the taxonomy.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified stock options) recognized on the entity's tax return exceeds compensation cost from non-qualified stock options recognized on the income statement. This element increases net cash provided by operating activities.

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