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Stock-Based Awards - Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 28, 2017
Oct. 29, 2016
Jul. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds from stock options exercised $ 204 $ 202  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to stock options $ 3,200    
Total compensation cost not yet recognized, period for recognition 2 years 6 months 1 day    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to stock options $ 9,500    
Total compensation cost not yet recognized, period for recognition 2 years 8 months 1 day    
Granted (in shares) 25,227    
Forfeited or canceled (in shares) 0    
Shares outstanding (in shares) 203,474   187,465
Share units vested (in shares) 9,218    
Performance RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to stock options $ 22,100    
Total compensation cost not yet recognized, period for recognition 2 years 1 month 1 day    
Compensation expense $ 8,700    
RSUs outstanding (in shares) 99,627    
Granted (in shares) 138,261    
Forfeited or canceled (in shares) 24,753    
Shares outstanding (in shares) 631,269   553,882
Share units vested (in shares) 36,121    
Target Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding (in shares) 487,635    
Supplemental Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 38,634    
Forfeited or canceled (in shares) 21,139    
Shares outstanding (in shares) 143,634