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Business Combinations, Finite-Lived Intangibles (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 27, 2013
Technology [Member]
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Fair Value $ 58,300
Weighted-average estimated useful lives (in years) 7.4
In Process Technology [Member]
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Fair Value 20,200
Weighted-average estimated useful lives (in years) 5.0
Customer Relationships [Member]
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Fair Value $ 18,200
Weighted-average estimated useful lives (in years) 6.8