Geographic Information and Concentration of Risk (Summary Of Sales Activity To Countries That Represented Greater Than 10% Of Total Net Sales) (Details)

3 Months Ended

6 Months Ended

Jul. 29, 2012

Jul. 31, 2011

Jul. 29, 2012

Jul. 31, 2011

United States [Member]

Geographic Information And Concentration Of Risk [Line Items]

Total net sales, percentage

17.00%

22.00%

17.00%

23.00%

China (Including Hong Kong) [Member]

Geographic Information And Concentration Of Risk [Line Items]

Total net sales, percentage

37.00%

39.00%

37.00%

Japan [Member]

Geographic Information And Concentration Of Risk [Line Items]

Total net sales, percentage

10.00%