Commitments and Contingencies (Details) (USD $)	12 Months Ended
Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Commitments and Contingencies Disclosure [Abstract]
Outstanding Inventory Purchase Obligation	$ 456,000,000
Outstanding Capital Purchase Obligations	51,000,000
Operating Leases, Future Minimum Payments Due [Abstract]
Future minimum operating lease payments - HQ	73,100,000
Operating Leases, Future Minimum Payments Due, Current	76,741,000
Operating Leases, Future Minimum Payments, Due in Two Years	66,242,000
Operating Leases, Future Minimum Payments, Due in Three Years	34,070,000
Operating Leases, Future Minimum Payments, Due in Four Years	26,793,000
Operating Leases, Future Minimum Payments, Due in Five Years	9,988,000
Operating Leases, Future Minimum Payments, Due Thereafter	27,477,000
Operating Leases, Future Minimum Payments Due	241,311,000
Operating Leases, Rent Expense	47,300,000us-gaap_LeaseAndRentalExpense	43,800,000us-gaap_LeaseAndRentalExpense	38,400,000us-gaap_LeaseAndRentalExpense
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Future minimum capital lease payments - HQ	20,900,000
Capital Leases, Future Minimum Payments Due, Current	5,303,000
Capital Leases, Future Minimum Payments Due in Two Years	5,453,000
Capital Leases, Future Minimum Payments Due in Three Years	5,607,000
Capital Leases, Future Minimum Payments Due in Four Years	5,767,000
Capital Leases, Future Minimum Payments Due in Five Years	26,000
Capital Leases, Future Minimum Payments Due Thereafter	0
Capital Leases, Future Minimum Payments Due	22,156,000
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	17,500,000
Capital Lease Obligations, Current	3,414,000us-gaap_CapitalLeaseObligationsCurrent
Capital Lease Obligations, Noncurrent	14,086,000	17,500,000
Loss Contingency [Abstract]
Aggregate purchase price of acquisition paid initially, net of direct costs	70,000,000
Excess of assessed fair value over acquisition price paid	$ 50,000,000

Additional liability assessed for difference between asset purchase price and alleged fair value.

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Future minimum capital lease payments - HQ

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No definition available.

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Future minimum operating lease payments - HQ

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The initial aggregate purchase price of certain assets acquired from 3dfx, net of direct costs.

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- Definition

Outstanding Capital Purchase Obligations

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The carrying amount of the cancelable and non-cancelable purchase order commitments for inventory as of the balance sheet date.

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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

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Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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