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Stock Based Compensation Additional - (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 01, 2015
Aug. 02, 2014
Aug. 01, 2015
Aug. 02, 2014
Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Compensation Expense     $ 1,940,000 $ 1,689,000  
Restricted Stock | Class A Common Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Unrecognized Compensation Expense $ 14,528,000 $ 12,330,000 $ 14,528,000 $ 12,330,000 $ 10,357,000
Remaining Weighted-Average Vesting Period     3 years 1 month 6 days 3 years 1 month 2 years 7 months 6 days
Compensation Expense $ 1,319,000 $ 1,183,000      
Employee Stock Purchase Plan | Class A Common Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares Sold     8,781 12,748  
Compensation Expense     $ 47,000 $ 52,000  
Employee Stock Purchase Plan Share Purchase Discount $ 5.40 $ 4.11 $ 5.40 $ 4.11