Share-Based Compensation (Details) (USD $)	12 Months Ended				12 Months Ended							12 Months Ended								12 Months Ended
	Jul. 29, 2011	Jul. 30, 2010	Jul. 31, 2009	Jul. 29, 2011 Directors Plan [Member]	Jul. 29, 2011 Employee Plan [Member]	Jul. 29, 2011 Amended and Restated Stock Option Plan [Member]	Jul. 29, 2011 Omnibus Plan 2010 [Member]	Jul. 29, 2011 Other Share Based Awards [Member]	Jul. 29, 2011 Performance Based Stock Unit [Member]	Jul. 29, 2011 Long-Term Performance Plan [Member]	Jul. 29, 2011 Omnibus Plan 2002 [Member]	Jul. 29, 2011 Options [Member]	Jul. 30, 2010 Options [Member]	Jul. 31, 2009 Options [Member]	Jul. 29, 2011 Nonvested Stock [Member]	Jul. 30, 2010 Nonvested Stock [Member]	Jul. 31, 2009 Nonvested Stock [Member]	Jul. 29, 2011 Shareholder Rights Plan [Member]	Sep. 23, 2011 Shareholder Rights Plan [Member]	Jul. 29, 2011 Series A Junior Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of the Company's common stock originally authorized for issuance (in shares)							1,500,000
Yearly exercisable cumulative rate (in hundredths)					33.00%	33.00%	33.00%		33.00%
Incremental compensation expense									$ 1,221,000
Number of shares that may be earned and awarded assuming no change in total shareholder return (in shares)									62,300
Percentage of shares that may be awarded to the executives, maximum (in hundredths)									150.00%
Maximum number of shares that may be earned and awarded assuming no change in total shareholder return (in shares)									93,450
Percentage change in total shareholder return (in hundredths)									101.75%
Number of shares earned (in shares)									15,847
Unrecognized compensation expense									2,486,000			1,292,000			2,747,000
Weighted-average period expected to recognize compensation cost (in years)									2.01			1.00			1.55
Weighted average period over which unrecognized compensation expense is expected to be recognized									2.01			1.00			1.55
Fair value of nonvested stock that vested															4,393,000	2,667,000	3,829,000
Compensation cost									989,000			2,155,000	3,194,000	3,680,000	6,652,000	9,999,000	3,266,000
Income tax benefit recognized for share-based compensation	2,576,000	3,470,000	937,000
Number of shares issued from the exercise of share-based compensation awards	784,793
Cash received from the exercise of share-based compensation awards	20,540,000
Excess tax benefit realized upon exercise of share-based compensation awards	4,108,000
Nonvested stock earned (in shares)										91,700
Outstanding awards at period end (in shares)				49,734	109,373	543,794	133,259	41,666			690,916	1,124,000	1,805,000
Number of years to expiration date from grant date (in years)					10Y	10Y	10Y
Common stock reserved for future issuance (in shares)	1,420,843						1,420,843
Option to purchase common stock (in shares)								25,000
Option to purchase nonvested stock grants (in shares)								25,000
Number of nonvested stock grants vest over three years (in shares)								16,666
Number of nonvested stock grants vest over a two-year period (in shares)								8,334
Fixed Options - shares [Roll Forward]
Outstanding at beginning of period (in shares)				49,734							690,916	1,805,000
Granted (in shares)												159,000
Exercised (in shares)												(656,000)
Forfeited (in shares)												0
Canceled (in shares)												(184,000)
Outstanding at end of period (in shares)				49,734	109,373	543,794	133,259	41,666			690,916	1,124,000	1,805,000
Exercisable (in shares)								16,667				860,000
Fixed Options - Weighted Average Price [Abstract]
Weighted average price, outstanding at beginning of period (in dollars per share)												$ 33.68
Weighted average price, granted (in dollars per share)												$ 50.02
Weighted average price, exercised (in dollars per share)												$ 35.29
Weighted average price, forfeited (in dollars per share)												$ 0
Weighted average price, canceled (in dollars per share)												$ 46.23
Weighted average price, outstanding at end of period (in dollars per share)												$ 33.01	$ 33.68
Weighted average price, exercisable (in dollars per share)												$ 34.07
Fixed Options - Weighted-Average Remaining Contractual Term [Abstract]
Weighted-average remaining contractual term, outstanding at end of period (in years)												5.43
Weighted average remaining contractual term, exercisable (in years)												4.71
Fixed Options - Aggregate Intrinsic Value [Abstract]
Aggregate intrinsic value, outstanding at end of period												13,604,000
Aggregate intrinsic value, exercisable												9,487,000
Weighted-average grant-date fair values of options granted (in dollars per share)												$ 16.81	$ 12.03	$ 9.33
Intrinsic values of options exercised												11,713,000	21,602,000	3,725,000
Total unrecognized compensation									2,486,000			1,292,000			2,747,000
Nonvested Stock [Roll Forward]
Unvested at beginning of period (in shares)															491,000
Granted (in shares)															35,000
Vested (in shares)															(182,000)
Forfeited (in shares)															(7,000)
Unvested at end of period (in shares)															337,000	491,000
Weighted average grant date fair value, unvested at beginning of period (in dollars per share)															$ 34.89
Weighted average grant date fair value, granted (in dollars per share)															$ 49.78
Weighted average grant date fair value, vested (in dollars per share)															$ 24.12
Forfeited (in dollars per share)															$ 45.55
Unvested at end of period (in dollars per share)															$ 42.03	$ 34.89
Number of executives eligible under the plan									7
Number of preferred share purchase right declared as dividend for each share of common stock outstanding																			1
Par value of common share outstanding ( in dollars per share)	$ 0.01	$ 0.01																	$ 0.01
Dividend payable, date to be paid																			Oct. 03, 2011
Dividends payable, date of record																			Oct. 03, 2011
Dividends payable, date declared																			Sep. 23, 2011
Number of share allowed for purchase under each right (in shares)																				0.01
Amount for which the holder can purchase one-one hundredth of a share under each right (in dollars per share)																				$ 200.00
Minimum number of days before rights can be exercised																		10
Minimum percentage of outstanding common stock ownership required to qualify for an "Acquiring Person"																		10.00%
Redemption price of the Right																		0.01
Quarterly dividends payments per share																		0.01
Amount entitled to receive per share upon liquidation of preferred share																		$ 1
Minimum percentage of an ownership of common stock by an Acquiring Person before board of directors may extinguish the right																		50.00%
Number of common stock shares that can be exchanged for each right if rights were extinguished																		1