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Stock Based Compensation Additional - (Details) - Class A Common Stock - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 03, 2019
Aug. 04, 2018
Aug. 03, 2019
Aug. 04, 2018
Feb. 02, 2019
Restricted Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Unrecognized Compensation Expense $ 14,622,000   $ 14,622,000   $ 11,989,000
Remaining Weighted-Average Vesting Period     2 years 2 months 12 days   2 years 2 months 12 days
Compensation Expense $ 1,495,000 $ 1,821,000 $ 2,140,000 $ 2,367,000  
Employee Stock Purchase Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares Sold     26,078 22,554  
Compensation Expense     $ 56,000 $ 50,000  
Employee Stock Purchase Plan Share Purchase Discount $ 2.16 $ 2.22 $ 2.16 $ 2.22