CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Cash flows from operating activities:
Net income	$ 630,587us-gaap_NetIncomeLoss	$ 439,990us-gaap_NetIncomeLoss	$ 562,536us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	220,125us-gaap_DepreciationAndAmortization	239,148us-gaap_DepreciationAndAmortization	226,235us-gaap_DepreciationAndAmortization
Stock-based compensation	157,841us-gaap_ShareBasedCompensation	136,295us-gaap_ShareBasedCompensation	136,662us-gaap_ShareBasedCompensation
Amortization of debt discount	27,967	4,600	0
Net gain on sale and disposal of long-lived assets and investments	(16,549)	(8,140)	0
Deferred income taxes	82,569us-gaap_DeferredIncomeTaxExpenseBenefit	15,430us-gaap_DeferredIncomeTaxExpenseBenefit	31,860us-gaap_DeferredIncomeTaxExpenseBenefit
Tax benefit from stock-based compensation	(18,456)	(25,801)	(68,710)
Others	24,099us-gaap_OtherNoncashIncomeExpense	21,387us-gaap_OtherNoncashIncomeExpense	47,911us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(49,324)	28,852	(118,940)
Inventories	(94,984)us-gaap_IncreaseDecreaseInInventories	24,651us-gaap_IncreaseDecreaseInInventories	(78,949)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	4,427	11,552	(11,723)
Accounts payable	(26,895)	(20,382)	10,885
Accrued liabilities and other current liabilities	5,322	5,352	17,353
Other long-term liabilities	41,073	37,788	(69,052)
Net cash provided by operating activities	905,656	835,146	824,172
Cash flows from investing activities:
Purchases of marketable securities	(2,861,809)	(3,065,404)	(2,378,445)
Proceeds from sales of marketable securities	1,371,982	1,926,817	854,993
Proceeds from maturities of marketable securities	864,798	585,150	962,417
Purchases of property and equipment and intangible assets	(122,381)	(255,186)	(183,309)
Proceeds from sale of long-lived assets and investments	20,862	24,781	0
Acquisition of businesses, net of cash and cash equivalents	0	(17,145)	0
Others	(500)	(4,950)	352
Net cash used in investing activities	(727,048)	(805,937)	(743,992)
Cash flows from financing activities:
Proceeds from issuance of convertible notes, net	0us-gaap_ProceedsFromConvertibleDebt	1,477,500us-gaap_ProceedsFromConvertibleDebt	0us-gaap_ProceedsFromConvertibleDebt
Purchase of convertible note hedges	0	(167,100)	0
Proceeds from the sale of common stock warrants	0us-gaap_ProceedsFromIssuanceOfWarrants	59,100us-gaap_ProceedsFromIssuanceOfWarrants	0us-gaap_ProceedsFromIssuanceOfWarrants
Proceeds from issuance of stock under employee stock plans	153,472	70,170	64,935
Payments related to repurchase of common stock	(813,600)	(887,304)	(100,000)
Dividends paid	(186,452)us-gaap_PaymentsOfDividends	(181,336)us-gaap_PaymentsOfDividends	(46,866)us-gaap_PaymentsOfDividends
Tax benefit from stock-based compensation	18,456	25,801	68,710
Payments under capital lease obligations	(2,917)	(2,239)	(2,049)
Others	(2,500)	(5,000)	0
Net cash (used in) provided by financing activities	(833,541)	389,592	(15,270)
Change in cash and cash equivalents	(654,933)	418,801	64,910
Cash and cash equivalents at beginning of period	1,151,587	732,786	667,876
Cash and cash equivalents at end of period	496,654	1,151,587	732,786
Supplemental disclosures of cash flow information:
Cash (received) paid for income taxes, net	14,470us-gaap_IncomeTaxesPaidNet	14,615us-gaap_IncomeTaxesPaidNet	(38,608)us-gaap_IncomeTaxesPaidNet
Cash paid for Intereston capital lease obligations	17,208us-gaap_InterestPaidNet	2,518us-gaap_InterestPaidNet	2,772us-gaap_InterestPaidNet
Non-cash investing and financing activities:
Change in unrealized gains (losses) from marketable securities	2,967us-gaap_UnrealizedGainLossOnSecurities	(5,104)us-gaap_UnrealizedGainLossOnSecurities	(633)us-gaap_UnrealizedGainLossOnSecurities
Assets acquired by assuming related liabilities	9,605us-gaap_LiabilitiesAssumed1	3,327us-gaap_LiabilitiesAssumed1	45,195us-gaap_LiabilitiesAssumed1
Goodwill adjustment related to previously acquired business	$ (25,000)	$ 0	$ 0

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- Definition

Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

+ References

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- Details

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- Definition

The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 27

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3581-108585

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- Definition

The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 8

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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- Definition

Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

+ References

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

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.

+ References

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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- Details

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Balance Type:	na
Period Type:	duration

- Definition

Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

+ References

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