Share-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Aug. 01, 2014 CompensationPlan		Aug. 02, 2013		Aug. 03, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of active compensation plans	1
Number of other compensation plans	2
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)	1,169,019
Number of outstanding awards under each plan (in shares)	345,320
Compensation cost	$ 7,924		$ 17,839		$ 14,420
Total income tax benefit	2,438		5,221		4,254
Number of shares issued from the exercise and vesting of share-based compensation awards (in shares)	145,900
Tax withholding payment net of cash received from issuance of share based compensation awards	(8,457)		6,454		17,602
Excess tax benefit realized upon exercise of share-based compensation awards	1,248
MSU Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	2,162		2,335		1,690
Total unrecognized compensation	2,745
Weighted average period in years	1 year 8 months 16 days
Fair Value Assumptions and Methodology [Abstract]
Dividend yield range (in hundredths)	0.00%		3.00%		2.20%
Expected volatility ( in hundredths)	25.00%		27.00%		45.00%
Risk-free interest rate, minimum (in hundredths)	0.70%
Risk-free interest rate (in hundredths)			0.30%		0.30%
Risk-free interest rate, maximum (in hundredths)	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	10 years
Yearly exercisable cumulative rate (in hundredths)	33.00%
Compensation cost	0		88		1,290
Total intrinsic values of options exercised	169	[1]	10,526	[1]	14,859	[1]
Summary of Stock Options [Roll Forward]
Outstanding at beginning of period (in shares)	101,138
Granted (in shares)	0		0		0
Exercised (in shares)	(2,423)
Forfeited (in shares)	0
Canceled (in shares)	(11,583)
Outstanding at end of period (in shares)	87,132		101,138
Exercisable (in shares)	87,132
Fixed Options - Weighted Average Price [Abstract]
Weighted average price, outstanding at beginning of period (in dollars per share)	$ 37.12
Weighted average price, granted (in dollars per share)	$ 0
Weighted average price, exercised (in dollars per share)	$ 36.70
Weighted average price, forfeited (in dollars per share)	$ 0
Weighted average price, canceled (in dollars per share)	$ 40.01
Weighted average price, outstanding at end of period (in dollars per share)	$ 36.75		$ 37.12
Weighted average price, exercisable (in dollars per share)	$ 36.75
Fixed Options - Weighted-Average Remaining Contractual Term [Abstract]
Weighted-average remaining contractual term, outstanding at end of period (in years)	1 year 11 months 12 days
Weighted average remaining contractual term, exercisable	1 year 11 months 12 days
Fixed Options - Aggregate Intrinsic Value [Abstract]
Aggregate intrinsic value, outstanding at end of period	5,220
Aggregate intrinsic value, exercisable	5,220
Nonvested Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	5,762		15,416		11,440
Total unrecognized compensation	1,959
Weighted average period in years	1 year 8 months 8 days
Nonvested Stock [Roll Forward]
Unvested at beginning of period (in shares)	82,854
Granted (in shares)	165,921
Vested (in shares)	(184,710)
Forfeited (in shares)	0
Unvested at end of period (in shares)	64,065		82,854
Weighted-Average Grant Date Fair Value, Nonvested Stock [Abstract]
Weighted average grant date fair value, unvested at beginning of period (in dollars per share)	$ 59.83
Weighted average grant date fair value, granted (in dollars per share)	$ 101.45
Weighted average grant date fair value, vested (in dollars per share)	$ 94.29
Forfeited (in dollars per share)	$ 0
Unvested at end of period (in dollars per share)	$ 68.25		$ 59.83
Total fair value of nonvested stock	$ 17,417		$ 7,445		$ 12,981
Nonvested Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Nonvested Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
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)	41,184
Omnibus Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of outstanding awards under each plan (in shares)	254,188
Omnibus Plan 2010 [Member] | MSU Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance period	3 years
Percentage of shares that may be awarded to the executives, maximum (in hundredths)	150.00%
Measurement period for average prices in consecutive calendar days	60 days
Measurement period for average prices prior to first business day of performance period	30 days
Measurement period for average prices after first business day of performance period	30 days
Long-Term Performance Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non vested stock earned (in shares)	17,441
Long-Term Performance Plan 2014 [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	2014
Vesting period	2 years
Long-Term Performance Plan 2014 [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	2015
Vesting period	3 years
Long-Term Performance Plan 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non vested stock earned (in shares)	62,426
Long-Term Performance Plan 2013 [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	2013
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
Vesting period	3 years
MSU Grants 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares accrued (in shares)	69,438
MSU Grants 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares accrued (in shares)	35,921
MSU Grants 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares accrued (in shares)	8,897
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)	49,948

[1] The intrinsic value for stock options is defined as the difference between the current market value and the grant price.