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Securities Available for Sale - Fair Value, Amortized Cost and Gross Unrealized Gains and Losses of Securities Available for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Nov. 01, 2014
Jan. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Fair Value $ 17,631 $ 18,766
State and Municipal Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 17,605 18,729
Gross Unrealized Gains 28 37
Gross Unrealized Losses (2)  
Fair Value $ 17,631 $ 18,766