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Stock Based Compensation Stock Grant Volatility (Details)
3 Months Ended
Apr. 28, 2012
Y
Apr. 30, 2011
Y
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum 0.00% 88.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum 0.00% 88.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum 0.00% 2.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum 0.00% 2.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 0 6
Share Based Compensation Arrangement by Share Based Payment Award Options Grant Term Limit 10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Share Based Compensation Arrangement by Share Based Payment Award Options Exercise Term Limit 10 years