3dfx (Details) (USD $)	6 Months Ended
	Jul. 27, 2014		Jan. 26, 2014
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]
Various administrative expenses and Trustee fees included in conditional settlement payment	5,600,000
Conditional settlement assessed to satisfy debts and liabilities owed to the general unsecured creditors of 3dfx	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
Property and equipment	1-2
Trademarks	5 years 0 months 0 days

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