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3dfx (Details) (USD $)
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12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
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Jan. 25, 2015
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Jan. 26, 2014
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Jan. 27, 2013
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| Notes to financial statements [Abstract] | |||||||
| Aggregate purchase price of acquisition paid initially | $ 74,200,000 | ||||||
| Accrued legal settlement | 0 | [1] | 30,600,000 | [1] | |||
| Litigation Reserve Administrative Expenses And Trustee Fee paid | 5,600,000 | ||||||
| Goodwill adjustment related to previously acquired business-3dfx | $ 25,000,000 | $ 0 | $ 0 | ||||
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