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Share-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Aug. 02, 2013
Aug. 03, 2012
Jul. 29, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of active compensation plans 1    
Number of other compensation plans 3    
Number of shares of the Company's common stock originally authorized for issuance (in shares) 1,500,000    
Common stock reserved for future issuance (in shares) 1,174,925    
Number of outstanding awards under each plan (in shares) 496,897    
Compensation cost $ 17,839 $ 14,420 $ 9,796
Income tax benefit recognized for share-based compensation 5,221 4,254 2,576
Number of shares issued from the exercise of share-based compensation awards (in shares) 366,603    
Cash received from the exercise of share-based compensation awards 6,454    
Excess tax benefit realized upon exercise of share-based compensation awards 2,332    
MSU Grants [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 2,335 1,690 989
Total unrecognized compensation 2,216    
Weighted average period in years 1 year 8 months 24 days    
Fair Value Assumptions and Methodology [Abstract]      
Dividend yield range (in hundredths) 3.00% 2.20% 1.60%
Expected volatility ( in hundredths) 27.00% 45.00% 43.00%
Risk-free interest rate (in hundredths) 0.30% 0.30% 0.80%
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of years to expiration date from grant date (in years) 10 years    
Yearly exercisable cumulative rate (in hundredths) 33.00%    
Compensation cost 88 1,290 2,155
Weighted-average grant-date fair values of options granted (in dollars per share) $ 0 $ 0 $ 16.81
Intrinsic values of options exercised 10,526 [1] 14,859 [1] 11,713 [1]
Total unrecognized compensation 0    
Fair Value Assumptions and Methodology [Abstract]      
Dividend yield range (in hundredths)     1.70%
Expected volatility ( in hundredths)     40.00%
Risk-free interest rate, minimum (in hundredths)     0.30%
Risk-free interest rate, maximum (in hundredths)     4.60%
Expected term     6 years 7 months 6 days [2]
Summary of Stock Options [Roll Forward]      
Outstanding at beginning of period (in shares) 403,957    
Granted (in shares) 0    
Exercised (in shares) (273,706)    
Forfeited (in shares) 0    
Canceled (in shares) (29,113)    
Outstanding at end of period (in shares) 101,138 403,957  
Exercisable (in shares) 101,138    
Fixed Options - Weighted Average Price [Abstract]      
Weighted average price, outstanding at beginning of period (in dollars per share) $ 33.22    
Weighted average price, granted (in dollars per share) $ 0    
Weighted average price, exercised (in dollars per share) $ 32.66    
Weighted average price, forfeited (in dollars per share) $ 0    
Weighted average price, canceled (in dollars per share) $ 24.98    
Weighted average price, outstanding at end of period (in dollars per share) $ 37.12 $ 33.22  
Weighted average price, exercisable (in dollars per share) $ 37.12    
Fixed Options - Weighted-Average Remaining Contractual Term [Abstract]      
Weighted-average remaining contractual term, outstanding at end of period (in years) 2 years 7 months 9 days    
Weighted average remaining contractual term, exercisable (in years) 2 years 7 months 9 days    
Fixed Options - Aggregate Intrinsic Value [Abstract]      
Aggregate intrinsic value, outstanding at end of period 6,455    
Aggregate intrinsic value, exercisable 6,455    
Nonvested Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 15,416 11,440 6,652
Total unrecognized compensation 3,122    
Weighted average period in years 2 years 4 months 27 days    
Nonvested Stock [Roll Forward]      
Unvested at beginning of period (in shares) 80,190    
Granted (in shares) 134,145    
Vested (in shares) (130,481)    
Forfeited (in shares) (1,000)    
Unvested at end of period (in shares) 82,854 80,190  
Weighted-Average Grant Date Fair Value, Nonvested Stock [Abstract]      
Weighted average grant date fair value, unvested at beginning of period (in dollars per share) $ 41.97    
Weighted average grant date fair value, granted (in dollars per share) $ 67.68    
Weighted average grant date fair value, vested (in dollars per share) $ 57.06    
Forfeited (in dollars per share) $ 42.21    
Unvested at end of period (in dollars per share) $ 59.83 $ 41.97  
Total fair value of nonvested stock 7,445 12,981 4,393
Nonvested Stock [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of years to expiration date from grant date (in years) 1 year    
Nonvested Stock [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of years to expiration date from grant date (in years) 3 years    
2000 Non-Executive Stock Option Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of outstanding awards under each plan (in shares) 12,083    
Amended and Restated Stock Option Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of outstanding awards under each plan (in shares) 43,107    
Omnibus Plan 2010 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of outstanding awards under each plan (in shares) 390,759    
Omnibus Plan 2010 [Member] | MSU Grants [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock grants vesting period 3 years    
Number of executives eligible under the plan 7    
Incremental compensation expense $ 1,221    
Percentage of shares that may be awarded to the executives, maximum (in hundredths) 150.00%    
Long-Term Performance Plan 2013 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non vested stock earned (in shares) 36,436    
Long-Term Performance Plan 2013 [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period 2013    
Stock grants vesting period 2 years    
Long-Term Performance Plan 2013 [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period 2014    
Stock grants vesting period 3 years    
Long Term Performance Plan 2012 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock grants vesting period 2 years    
Non vested stock earned (in shares) 157,356    
Long Term Performance Plan 2012 [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period 2012    
Long Term Performance Plan 2012 [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period 2013    
MSU Grants 2011 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares accrued (in shares) 41,963    
MSU Grants 2012 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares accrued (in shares) 56,301    
MSU Grants 2013 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares accrued (in shares) 20,849    
2002 Omnibus Incentive Compensation Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of outstanding awards under each plan (in shares) 50,948    
[1] The intrinsic value for stock options is defined as the difference between the current market value and the grant price.
[2] Stock options granted in 2011 were defeased and replaced with MSU Grants (see sub-section above entitled "Performance-Based Market Stock Units").