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Derivative Instruments and Hedging Activities (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
May 03, 2013
May 03, 2013
Interest Rate Swap [Member]
Aug. 03, 2012
Interest Rate Swap [Member]
May 03, 2013
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Aug. 03, 2012
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
May 03, 2013
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Interest Expense [Member]
Apr. 27, 2012
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Interest Expense [Member]
May 03, 2013
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Interest Expense [Member]
Apr. 27, 2012
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Interest Expense [Member]
May 03, 2013
Current interest rate swap liability [Member]
Aug. 03, 2012
Current interest rate swap liability [Member]
May 03, 2013
Current interest rate swap liability [Member]
Interest Rate Swap [Member]
Aug. 03, 2012
Current interest rate swap liability [Member]
Interest Rate Swap [Member]
May 03, 2013
Long-term interest rate swap liability [Member]
Interest Rate Swap [Member]
Aug. 03, 2012
Long-term interest rate swap liability [Member]
Interest Rate Swap [Member]
May 03, 2013
Interest Rate Swap Aug 10, 2010 [Member]
May 03, 2013
Two Year Interest Rate Swap July 25, 2011 [Member]
May 03, 2013
Three Year Interest Rate Swap July 25, 2011 [Member]
May 03, 2013
Interest Rate Swap 1 September 19, 2011 [Member]
May 03, 2013
Interest Rate Swap 2 September 19, 2011 [Member]
May 03, 2013
Interest Rate Swap December 7, 2011 [Member]
May 03, 2013
Interest Rate Swap March 18, 2013 [Member]
May 03, 2013
Interest Rate Swap April 8, 2013 [Member]
May 03, 2013
Interest Rate Swap April 15, 2013 [Member]
May 03, 2013
Interest Rate Swap April 22, 2013 [Member]
May 03, 2013
Interest Rate Swap April 25, 2013 [Member]
May 03, 2013
Interest Rate Swap May 4, 2006 [Member]
Derivative [Line Items]                                                      
Company's credit spread (in hundredths) 1.75%                                                    
Effective date                               May 03, 2013 May 03, 2013 May 03, 2013 May 03, 2013 May 03, 2013 May 03, 2013 May 03, 2015 May 03, 2015 May 03, 2015 May 03, 2015 May 03, 2015  
Term                               2 years 2 years 3 years 2 years 2 years 3 years 3 years 2 years 2 years 3 years 3 years  
Notional amount                               $ 200,000 $ 50,000 $ 50,000 $ 25,000 $ 25,000 $ 50,000 $ 50,000 $ 50,000 $ 50,000 $ 25,000 $ 25,000 $ 525,000
Fixed rate (in hundredths)                               2.73% 2.00% 2.45% 1.05% 1.05% 1.40% 1.51% 1.05% 1.03% 1.30% 1.29% 5.57%
Derivatives, Fair Value [Line Items]                                                      
Fair Value   16,888 34,381                 0 20,215 16,888 14,166                        
Reduction in the fair value                   360 851                                
Estimated pre-tax portion of AOCL that is expected to be reclassified into earnings over the next twelve months 5,959                                                    
Derivative Instruments, Gain (Loss) [Line Items]                                                      
Amount of Income Recognized in AOCL on Derivative (Effective Portion)       17,493 17,223                                            
Amount of Loss Reclassified from AOCL into Income (Effective Portion)           $ 13,743 $ 7,222 $ 20,773 $ 22,134