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Discontinued Operations - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended
Aug. 03, 2013
Jan. 31, 2013
Jan. 30, 2012
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]      
Net sales price   $ 18,600,000 $ 1,000,000
Cash reserve in escrow $ 1,800,000    
Period of cash reserved 12 months    
Period of transition services and manufacturing, Minimum 9 months    
Period of transition services and manufacturing, Maximum 12 months