Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 01, 2014	Aug. 02, 2013	Aug. 03, 2012
Derivative [Line Items]
Company's credit spread (in hundredths)	1.50%	1.50%
Derivatives, Fair Value [Line Items]
Fair value, liability	$ 7,943	$ 11,664
Offsetting of derivative liabilities in consolidated balance sheets [Abstract]
Net Liability Amount Presented in the Balance Sheets	7,943	11,664
Estimated pre-tax portion of AOCL that is expected to be reclassified into earnings over the next twelve months	6,014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income, net of tax	1,879	14,546	16,874
Amounts reclassified out of AOCL related to interest expense and provision for income taxes [Abstract]
Interest expense	17,557	35,742	44,687
Provision for income taxes	58,721	48,517	43,207
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Fair value, asset	240	883
Fair value, liability	7,943	11,644
Offsetting of derivative assets in balance sheets [Abstract]
Gross Asset Amounts	240	1,159
Liability Amount Offset	0	(276)
Net Asset Amount Presented in the Balance Sheets	240	883
Offsetting of derivative liabilities in consolidated balance sheets [Abstract]
Gross Liability Amounts	8,441	13,120
Asset Amount Offset	(498)	(1,476)
Net Liability Amount Presented in the Balance Sheets	7,943	11,644
Reduction in the fair value	62	123
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCL, Beginning balance	(6,612)
Other comprehensive income before reclassifications	6,836
Amounts reclassified from AOCL into earnings	(4,957)
Other comprehensive income, net of tax	1,879
AOCL, Ending balance	(4,733)	(6,612)
Amounts reclassified out of AOCL related to interest expense and provision for income taxes [Abstract]
Interest expense	(8,068)
Provision for income taxes	3,111
Net of tax	(4,957)
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income Recognized in AOCL on Derivative (Effective Portion)	3,058	23,620	17,223
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from AOCL into Income (Effective Portion)	8,068	20,773	35,903
Interest Rate Swap [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value, asset	240	883
Offsetting of derivative assets in balance sheets [Abstract]
Net Asset Amount Presented in the Balance Sheets	240	883
Interest Rate Swap [Member] | Current interest rate swap liability [Member]
Derivatives, Fair Value [Line Items]
Fair value, liability	4,704	0
Offsetting of derivative liabilities in consolidated balance sheets [Abstract]
Net Liability Amount Presented in the Balance Sheets	4,704	0
Interest Rate Swap [Member] | Long-term interest rate swap liability [Member]
Derivatives, Fair Value [Line Items]
Fair value, liability	3,239	11,644
Offsetting of derivative liabilities in consolidated balance sheets [Abstract]
Net Liability Amount Presented in the Balance Sheets	3,239	11,644
Interest Rate Swap [Member] | Interest Rate Swap Aug 10, 2010 [Member]
Derivative [Line Items]
Effective date	May 03, 2013
Term	2 years
Notional amount	200,000
Fixed rate (in hundredths)	2.73%
Interest Rate Swap [Member] | Two Year Interest Rate Swap July 25, 2011 [Member]
Derivative [Line Items]
Effective date	May 03, 2013
Term	2 years
Notional amount	50,000
Fixed rate (in hundredths)	2.00%
Interest Rate Swap [Member] | Three Year Interest Rate Swap July 25, 2011 [Member]
Derivative [Line Items]
Effective date	May 03, 2013
Term	3 years
Notional amount	50,000
Fixed rate (in hundredths)	2.45%
Interest Rate Swap [Member] | Interest Rate Swap 1 September 19, 2011 [Member]
Derivative [Line Items]
Effective date	May 03, 2013
Term	2 years
Notional amount	25,000
Fixed rate (in hundredths)	1.05%
Interest Rate Swap [Member] | Interest Rate Swap 2 September 19, 2011 [Member]
Derivative [Line Items]
Effective date	May 03, 2013
Term	2 years
Notional amount	25,000
Fixed rate (in hundredths)	1.05%
Interest Rate Swap [Member] | Interest Rate Swap December 7, 2011 [Member]
Derivative [Line Items]
Effective date	May 03, 2013
Term	3 years
Notional amount	50,000
Fixed rate (in hundredths)	1.40%
Interest Rate Swap [Member] | Interest Rate Swap March 18, 2013 [Member]
Derivative [Line Items]
Effective date	May 03, 2015
Term	3 years
Notional amount	50,000
Fixed rate (in hundredths)	1.51%
Interest Rate Swap [Member] | Interest Rate Swap April 8, 2013 [Member]
Derivative [Line Items]
Effective date	May 03, 2015
Term	2 years
Notional amount	50,000
Fixed rate (in hundredths)	1.05%
Interest Rate Swap [Member] | Interest Rate Swap April 15, 2013 [Member]
Derivative [Line Items]
Effective date	May 03, 2015
Term	2 years
Notional amount	50,000
Fixed rate (in hundredths)	1.03%
Interest Rate Swap [Member] | Interest Rate Swap April 22, 2013 [Member]
Derivative [Line Items]
Effective date	May 03, 2015
Term	3 years
Notional amount	25,000
Fixed rate (in hundredths)	1.30%
Interest Rate Swap [Member] | Interest Rate Swap April 25, 2013 [Member]
Derivative [Line Items]
Effective date	May 03, 2015
Term	3 years
Notional amount	25,000
Fixed rate (in hundredths)	1.29%
Interest Rate Swap [Member] | Interest Rate Swap June 18, 2014 [Member]
Derivative [Line Items]
Increase in notional amount each year	40,000
Maximum notional amount	160,000
Effective date	May 03, 2015
Term	4 years
Notional amount	40,000
Fixed rate (in hundredths)	2.51%
Interest Rate Swap [Member] | Interest Rate Swap June 24, 2014 [Member]
Derivative [Line Items]
Increase in notional amount each year	30,000
Maximum notional amount	120,000
Effective date	May 03, 2015
Term	4 years
Notional amount	30,000
Fixed rate (in hundredths)	2.51%
Interest Rate Swap [Member] | Interest Rate Swap July 1, 2014 [Member]
Derivative [Line Items]
Increase in notional amount each year	30,000
Maximum notional amount	120,000
Effective date	May 05, 2015
Term	4 years
Notional amount	$ 30,000
Fixed rate (in hundredths)	2.43%