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Guarantees (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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Jan. 30, 2011
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| Notes to financial statements [Abstract] | ||||||||||||
| Cumulative Net Warranty charge | $ 475,900,000 | |||||||||||
| Release of warranty accrual | 7,800,000 | |||||||||||
| Estimated product warranty liabilities | ||||||||||||
| Balance at beginning of period | 7,571,000 | [1] | 14,874,000 | [1] | 18,406,000 | [1] | ||||||
| Additions | 5,441,000 | 6,786,000 | 5,738,000 | |||||||||
| Deductions | (5,489,000) | [2] | (14,089,000) | [2] | (9,270,000) | [2] | ||||||
| Balance at end of period | 7,523,000 | 7,571,000 | [1] | 14,874,000 | [1] | 18,406,000 | [1] | |||||
| Remaining amount of the warranty accrual associated with incremental repair and replacement costs from a weak die/packaging material set | 9,600,000 | 13,200,000 | ||||||||||
| Payments related to warranty accrual | $ 1,800,000 | $ 3,000,000 | ||||||||||
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