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Stock Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2021
Aug. 01, 2020
Jul. 31, 2021
Aug. 01, 2020
Jan. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense for ESPP $ 5,000 $ 7,000 $ 16,000 $ 18,000  
Income tax benefit - ESPP 1,000 $ 2,000 4,000 6,000  
Restricted Stock Units and Performance Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of stock awards vested during period     $ 3,100,000 $ 4,400,000  
Weighted average grant date fair value of awards     $ 28.21 $ 7.44  
Granted     215,972    
Vested     (210,296)    
Unrecognized share-based compensation expense 6,200,000   $ 6,200,000    
Unrecognized compensation cost, recognition period     1 year 2 months 12 days    
Restricted Stock and Other Stock Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of stock awards vested during period     $ 26,000 $ 1,300,000  
Weighted average grant date fair value of awards     $ 32.65 $ 12.46  
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average grant date fair value of awards     $ 32.65    
Granted     8,162    
Vested     (802)    
Stock Appreciation Rights (SARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average grant date fair value of awards     $ 2.76    
Unrecognized share-based compensation expense $ 167,000   $ 167,000    
Unrecognized compensation cost, recognition period     8 months 12 days    
Defined maximum gain     $ 5.00 $ 5.00 $ 5.00
Exercise price         $ 30.94