Debt (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended				6 Months Ended
	Jan. 27, 2012	Jul. 29, 2011	Jul. 29, 2011 Revolving Credit Facility 2011 [Member]	Jan. 27, 2012 Revolving Credit Facility 2011 [Member]	Jan. 27, 2012 Term Loans Payable [Member] Term Loan Payable on or Before July 8, 2016 [Member]	Jul. 29, 2011 Term Loans Payable [Member] Term Loan Payable on or Before July 8, 2016 [Member]	Jan. 27, 2012 Notes Payable, Other Payables [Member]	Jul. 29, 2011 Notes Payable, Other Payables [Member]	Jan. 27, 2012 Line of Credit 2011 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 550,195	$ 550,246	$ 318,750	$ 318,750	$ 231,250	$ 231,250	$ 195	$ 246
Current maturities	(9,480)	(103)
Long-term debt	540,715	550,143
Maximum borrowing capacity			500,000						750,000
Outstanding borrowings under the Revolving Credit Facility			318,750
Line of credit facility, expiration date			2016-07-08
Maturity date							Oct. 16, 2013
Amount of standby letters of credit			28,606
Current borrowing capacity			152,644
Weighted average interest rates of the Company's swapped debt (in hundredths)	7.57%
Restrictions on dividends payable	The Credit Facility also imposes restrictions on the amount of dividends the Company is permitted to pay. If there is no default existing and the total of our availability under the Revolving Credit Facility plus the Company’s cash and cash equivalents on hand is at least $100,000, the Company may: (1) pay cash dividends on shares of its common stock if the aggregate amount of dividends paid in any fiscal year is less than 15% of Consolidated EBITDA from continuing operations (as defined in the Credit Facility) during the immediately preceding fiscal year; or (2) increase its regular quarterly cash dividend in any quarter by an amount not to exceed the greater of $0.01 per share or 10% of the amount of the dividend paid in the prior fiscal quarter.
Original principal amount of notes payable							507
Monthly installment of principal and interest on notes payable							$ 9
Interest rate during the period (in hundredths)							2.88%