Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Jan. 26, 2014		Jan. 27, 2013		Jan. 29, 2012
Commitments and Contingencies Disclosure [Abstract]
Outstanding Inventory Purchase Obligation	$ 397,700,000		$ 470,300,000
Outstanding Capital Purchase Obligations	41,300,000		44,800,000
Operating Leases, Future Minimum Payments Due [Abstract]
Future minimum operating lease payments - HQ	81,000,000
Operating Leases, Future Minimum Payments Due, Current	74,007,000
Operating Leases, Future Minimum Payments, Due in Two Years	70,800,000
Operating Leases, Future Minimum Payments, Due in Three Years	60,884,000
Operating Leases, Future Minimum Payments, Due in Four Years	29,262,000
Operating Leases, Future Minimum Payments, Due in Five Years	22,202,000
Operating Leases, Future Minimum Payments, Due Thereafter	34,693,000
Operating Leases, Future Minimum Payments Due	291,848,000
Operating Leases, Rent Expense	43,800,000		38,400,000		37,900,000
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Future minimum capital lease payments - HQ	25,800,000
Capital Leases, Future Minimum Payments Due, Current	5,168,000
Capital Leases, Future Minimum Payments Due in Two Years	5,303,000
Capital Leases, Future Minimum Payments Due in Three Years	5,453,000
Capital Leases, Future Minimum Payments Due in Four Years	5,607,000
Capital Leases, Future Minimum Payments Due in Five Years	5,767,000
Capital Leases, Future Minimum Payments Due Thereafter	26,000
Capital Leases, Future Minimum Payments Due	27,324,000
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	20,417,000
Capital Lease Obligations, Current	2,917,000
Capital Lease Obligations, Noncurrent	17,500,000		18,998,000
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
Assessed value of asset purchase	108,000,000
Accrued legal settlement	30,600,000	[1]	30,600,000	[1]
Various administrative expenses and Trustee fees included in conditional settlement payment	25,000,000
Litigation Reserve Administrative Expenses And Trustee Fee	$ 5,600,000

[1] Please refer to Note 12 of these Notes to the Consolidated Financial Statements for discussion regarding the 3dfx litigation.