3dfx (Details) (USD $)	12 Months Ended
	Jan. 26, 2014		Jan. 27, 2013
Notes to financial statements [Abstract]
Aggregate purchase price of acquisition paid initially	$ 74,200,000
Accrued legal settlement	30,600,000	[1]	30,600,000	[1]
Litigation Reserve Administrative Expenses And Trustee Fee	5,600,000
Various administrative expenses and Trustee fees included in conditional settlement payment	25,000,000
Aggregate purchase price of acquisition assessed after conditional settlement	95,000,000
Direct transaction costs for acquisition	4,200,000
Fair Market Value
Property and equipment	2,433,000
Trademarks	11,310,000
Goodwill	85,418,000
Total	$ 99,161,000
Straight-Line Amortization Period
Acquired Property and equipment amortization period - min	1 year 0 months 0 days
Acquired Property Plant And Equipment Amortization Period - max	2 years 0 months 0 days
Trademarks	5 years 0 months 0 days

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