CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Revenue	$ 4,681,507us-gaap_Revenues	$ 4,130,162us-gaap_Revenues	$ 4,280,159us-gaap_Revenues
Cost of revenue	2,082,030us-gaap_CostOfRevenue	1,862,399us-gaap_CostOfRevenue	2,053,816us-gaap_CostOfRevenue
Gross profit	2,599,477us-gaap_GrossProfit	2,267,763us-gaap_GrossProfit	2,226,343us-gaap_GrossProfit
Operating expenses
Research and development	1,359,725us-gaap_ResearchAndDevelopmentExpense	1,335,834us-gaap_ResearchAndDevelopmentExpense	1,147,282us-gaap_ResearchAndDevelopmentExpense
Sales, general and administrative	480,763	435,702	430,822
Total operating expenses	1,840,488us-gaap_OperatingExpenses	1,771,536us-gaap_OperatingExpenses	1,578,104us-gaap_OperatingExpenses
Income from operations	758,989us-gaap_OperatingIncomeLoss	496,227us-gaap_OperatingIncomeLoss	648,239us-gaap_OperatingIncomeLoss
Interest income	28,090us-gaap_InvestmentIncomeInterest	17,119us-gaap_InvestmentIncomeInterest	19,908us-gaap_InvestmentIncomeInterest
Interest expense	46,133us-gaap_InterestExpense	10,443us-gaap_InterestExpense	3,294us-gaap_InterestExpense
Other income (expense), net	13,890us-gaap_OtherNonoperatingIncomeExpense	7,351us-gaap_OtherNonoperatingIncomeExpense	(2,814)us-gaap_OtherNonoperatingIncomeExpense
Income before income tax	754,836	510,254	662,039
Income tax expense	124,249us-gaap_IncomeTaxExpenseBenefit	70,264us-gaap_IncomeTaxExpenseBenefit	99,503us-gaap_IncomeTaxExpenseBenefit
Net income	$ 630,587us-gaap_NetIncomeLoss	$ 439,990us-gaap_NetIncomeLoss	$ 562,536us-gaap_NetIncomeLoss
Basic net income per share	$ 1.14us-gaap_EarningsPerShareBasic	$ 0.75us-gaap_EarningsPerShareBasic	$ 0.91us-gaap_EarningsPerShareBasic
Diluted net income per share	$ 1.12us-gaap_EarningsPerShareDiluted	$ 0.74us-gaap_EarningsPerShareDiluted	$ 0.90us-gaap_EarningsPerShareDiluted
Weighted average shares used in basic per share computation (in shares)	552,319	587,893	619,324
Weighted average shares used in diluted per share computation (in shares)	563,068	594,517	624,957
Cash dividends declared and paid per common share	$ 0.340	$ 0.310	$ 0.075

Aggregate dividends declared during the period for each share of common stock outstanding.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770