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Share-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 1 Months Ended
Jul. 28, 2012
Jul. 30, 2011
Jul. 28, 2012
Year
Jul. 30, 2011
Jul. 28, 2012
2006 Stock Incentive Plan
Maximum
May 24, 2012
2012 Stock Incentive Plan
May 24, 2012
2012 Stock Incentive Plan
Maximum
Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         4,987,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of additional Shares Available for Grant           3,375,000  
Grants term of appreciation             7
Total fair value of share grants $ 0.1 $ 0.1 $ 6.3 $ 9.6      
Total share-based compensation expense     0.8        
Amount of unrecognized compensation expense related to nonvested awards $ 9.2   $ 9.2        
Weighted average period in which unrecognized compensation expense related to nonvested awards will be recognized, in years     1.0