Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended	3 Months Ended		6 Months Ended
	Jan. 30, 2015	Aug. 01, 2014	Jan. 30, 2015	Jan. 31, 2014	Jan. 31, 2014
Derivative [Line Items]
Company's credit spread (in hundredths)	1.25%		1.25%
Offsetting of derivative liabilities in condensed consolidated balance sheets [Abstract]
Estimated pre-tax portion of AOCL that is expected to be reclassified into earnings over the next twelve months	$ 4,802		$ 4,802
Current Interest Rate Swap Liability [Member]
Offsetting of derivative liabilities in condensed consolidated balance sheets [Abstract]
Reduction in the fair value	741	62
Interest Rate Swap Aug 10, 2010 [Member]
Derivative [Line Items]
Trade date	Aug. 10, 2010
Effective date	May 03, 2013
Term	2 years
Notional amount	200,000		200,000
Fixed rate (in hundredths)	2.73%		2.73%
Two Year Interest Rate Swap July 25, 2011 [Member]
Derivative [Line Items]
Trade date	Jul. 25, 2011
Effective date	May 03, 2013
Term	2 years
Notional amount	50,000		50,000
Fixed rate (in hundredths)	2.00%		2.00%
Three Year Interest Rate Swap July 25, 2011 [Member]
Derivative [Line Items]
Trade date	Jul. 25, 2011
Effective date	May 03, 2013
Term	3 years
Notional amount	50,000		50,000
Fixed rate (in hundredths)	2.45%		2.45%
Interest Rate Swap 1 September 19, 2011 [Member]
Derivative [Line Items]
Trade date	Sep. 19, 2011
Effective date	May 03, 2013
Term	2 years
Notional amount	25,000		25,000
Fixed rate (in hundredths)	1.05%		1.05%
Interest Rate Swap 2 September 19, 2011 [Member]
Derivative [Line Items]
Trade date	Sep. 19, 2011
Effective date	May 03, 2013
Term	2 years
Notional amount	25,000		25,000
Fixed rate (in hundredths)	1.05%		1.05%
Interest Rate Swap December 7, 2011 [Member]
Derivative [Line Items]
Trade date	Dec. 07, 2011
Effective date	May 03, 2013
Term	3 years
Notional amount	50,000		50,000
Fixed rate (in hundredths)	1.40%		1.40%
Interest Rate Swap March 18, 2013 [Member]
Derivative [Line Items]
Trade date	Mar. 18, 2013
Effective date	May 03, 2015
Term	3 years
Notional amount	50,000		50,000
Fixed rate (in hundredths)	1.51%		1.51%
Interest Rate Swap April 8, 2013 [Member]
Derivative [Line Items]
Trade date	Apr. 08, 2013
Effective date	May 03, 2015
Term	2 years
Notional amount	50,000		50,000
Fixed rate (in hundredths)	1.05%		1.05%
Interest Rate Swap April 15, 2013 [Member]
Derivative [Line Items]
Trade date	Apr. 15, 2013
Effective date	May 03, 2015
Term	2 years
Notional amount	50,000		50,000
Fixed rate (in hundredths)	1.03%		1.03%
Interest Rate Swap April 22, 2013 [Member]
Derivative [Line Items]
Trade date	Apr. 22, 2013
Effective date	May 03, 2015
Term	3 years
Notional amount	25,000		25,000
Fixed rate (in hundredths)	1.30%		1.30%
Interest Rate Swap April 25, 2013 [Member]
Derivative [Line Items]
Trade date	Apr. 25, 2013
Effective date	May 03, 2015
Term	3 years
Notional amount	25,000		25,000
Fixed rate (in hundredths)	1.29%		1.29%
Interest Rate Swap June 18, 2014 [Member]
Derivative [Line Items]
Trade date	Jun. 18, 2014
Effective date	May 03, 2015
Term	4 years
Notional amount	40,000		40,000
Fixed rate (in hundredths)	2.51%		2.51%
Interest Rate Swap June 24, 2014 [Member]
Derivative [Line Items]
Trade date	Jun. 24, 2014
Effective date	May 03, 2015
Term	4 years
Notional amount	30,000		30,000
Fixed rate (in hundredths)	2.51%		2.51%
Interest Rate Swap July 1, 2014 [Member]
Derivative [Line Items]
Trade date	Jul. 01, 2014
Effective date	May 05, 2015
Term	4 years
Notional amount	30,000		30,000
Fixed rate (in hundredths)	2.43%		2.43%
Interest Rate Swap January 30, 2015 [Member]
Derivative [Line Items]
Trade date	Jan. 30, 2015
Effective date	May 03, 2019
Term	2 years
Notional amount	80,000		80,000
Fixed rate (in hundredths)	2.15%		2.15%
Interest Rate Swap 1 January 30, 2015 [Member]
Derivative [Line Items]
Trade date	Jan. 30, 2015
Effective date	May 03, 2019
Term	2 years
Notional amount	60,000		60,000
Fixed rate (in hundredths)	2.16%		2.16%
Interest Rate Swap 2 January 30, 2015 [Member]
Derivative [Line Items]
Trade date	Jan. 30, 2015
Effective date	May 04, 2021
Term	3 years
Notional amount	120,000		120,000
Fixed rate (in hundredths)	2.41%		2.41%
Interest Rate Swap 3 January 30, 2015 [Member]
Derivative [Line Items]
Trade date	Jan. 30, 2015
Effective date	May 03, 2019
Term	2 years
Notional amount	60,000		60,000
Fixed rate (in hundredths)	2.15%		2.15%
Interest Rate Swap 4 January 30, 2015 [Member]
Derivative [Line Items]
Trade date	Jan. 30, 2015
Effective date	May 04, 2021
Term	3 years
Notional amount	80,000		80,000
Fixed rate (in hundredths)	2.40%		2.40%
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Fair value, assets	0	240	0
Fair value, liability	14,590	7,943	14,590
Offsetting of derivative assets in condensed consolidated balance sheets [Abstract]
Gross Asset Amounts	0	240	0
Liability Amount Offset	0	0	0
Net Asset Amount Presented in the Balance Sheets	0	240	0
Offsetting of derivative liabilities in condensed consolidated balance sheets [Abstract]
Gross Liability Amounts	14,590	8,441	14,590
Asset Amount Offset	0	(498)	0
Net Liability Amount Presented in the Balance Sheets	14,590	7,943	14,590
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Income Recognized in AOCL on Derivatives (Effective Portion)	6,887	3,058
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)	4,016		2,005	1,984	4,026
Interest Rate Swap [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value, assets	0	240	0
Offsetting of derivative assets in condensed consolidated balance sheets [Abstract]
Net Asset Amount Presented in the Balance Sheets	0	240	0
Interest Rate Swap [Member] | Current Interest Rate Swap Liability [Member]
Derivatives, Fair Value [Line Items]
Fair value, liability	1,633	4,704	1,633
Offsetting of derivative liabilities in condensed consolidated balance sheets [Abstract]
Net Liability Amount Presented in the Balance Sheets	1,633	4,704	1,633
Interest Rate Swap [Member] | Long-term Interest Rate Swap Liability [Member]
Derivatives, Fair Value [Line Items]
Fair value, liability	12,957	3,239	12,957
Offsetting of derivative liabilities in condensed consolidated balance sheets [Abstract]
Net Liability Amount Presented in the Balance Sheets	12,957	3,239	12,957
Interest Rate Swap [Member] | Interest Rate Swap June 18, 2014 [Member]
Derivative [Line Items]
Increase in notional amount each year	40,000		40,000
Maximum notional amount	160,000		160,000
Interest Rate Swap [Member] | Interest Rate Swap June 24, 2014 [Member]
Derivative [Line Items]
Increase in notional amount each year	30,000		30,000
Maximum notional amount	120,000		120,000
Interest Rate Swap [Member] | Interest Rate Swap July 1, 2014 [Member]
Derivative [Line Items]
Increase in notional amount each year	30,000		30,000
Maximum notional amount	$ 120,000		$ 120,000