Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended		6 Months Ended	12 Months Ended
	Jan. 28, 2011	Jul. 29, 2011	Jan. 27, 2012	Jan. 27, 2012 Interest Rate Swap [Member] Cash Flow Hedging [Member] Other Comprehensive Income (Loss) [Member]	Jan. 27, 2012 Interest Rate Swap [Member] Cash Flow Hedging [Member] Interest Expense [Member]	Jan. 28, 2011 Interest Rate Swap [Member] Cash Flow Hedging [Member] Interest Expense [Member]	Jan. 27, 2012 Interest Rate Swap [Member] Cash Flow Hedging [Member] Interest Expense [Member]	Jan. 27, 2012 Interest Rate Swap Asset [Member] Interest Rate Swap [Member]	Jan. 27, 2012 Interest Rate Swap Liability [Member] Interest Rate Swap [Member]	Jul. 29, 2011 Interest Rate Swap Liability [Member] Interest Rate Swap [Member]	May 03, 2012 Interest Rate Swap 2006 [Member]	Jan. 27, 2012 Interest Rate Swap 2006 [Member]	Jul. 29, 2011 Interest Rate Swap 2006 [Member]	Jan. 27, 2012 Interest Rate Swap 2010 [Member]	Jan. 27, 2012 Two Year Interest Rate Swap 2011 [Member]	Jan. 27, 2012 Three Year Interest Rate Swap 2011 [Member]	Jan. 27, 2012 Interest Rate Swap 1 September 2011 [Member]	Jan. 27, 2012 Interest Rate Swap 2 September 2011 [Member]	Jan. 27, 2012 Interest Rate Swap December 2011 [Member]
Derivative [Line Items]
Interest rate swap												$ 45,050	$ 51,604
Fixed interest rate amount for swapped portion of debt (in hundredths)												5.57%		2.73%	2.00%	2.45%	1.05%	1.05%	1.40%
Company's credit spread (in hundredths)			2.00%
Notional principal amount of underlying interest rate swap											525,000	550,000		200,000	50,000	50,000	25,000	25,000	50,000
Life of interest rate swap (in years)												7Y		2Y	2Y	3Y	2Y	2Y	3Y
Notional amount of interest rate derivatives											525,000	550,000		200,000	50,000	50,000	25,000	25,000	50,000
Estimated pre-tax portion of AOCL that is expected to be reclassified into earnings over the next twelve months								27,325
Derivatives, Fair Value [Line Items]
Estimated pre-tax portion of AOCL that is expected to be reclassified into earnings over the next twelve months								27,325
Reduction in fair value									1,621	1,546
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income (Loss) Recognized in AOCL on Derivative (Effective Portion)		14,677		6,554
Amount of Loss Reclassified from AOCL into Income (Effective Portion)	$ 15,113				$ 7,467	$ 7,518	$ 14,912