Debt (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 27, 2012	Jul. 29, 2011
Debt Instrument [Line Items]
Long-term debt, gross	$ 550,169	$ 550,246
Current maturities	(14,168)	(103)
Long-term debt	536,001	550,143	[1]
Line of credit facility, expiration date	2016-07-08
Weighted average interest rates of the Company's swapped term loans (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 and the amount of shares the Company is permitted to repurchase. In April 2012, the Company amended the Credit Facility to provide more flexibility with regard to the dividends the Company is permitted to pay as well as the amount of shares the Company is able to repurchase. Under the amended Credit Facility, if there is no default existing and the total of the Company's availability under the Revolving Credit Facility plus the Company's cash and cash equivalents on hand is at least $100,000 (the "liquidity requirements"), the Company may declare and pay cash dividends on shares of its common stock if the aggregate amount of dividends paid in any fiscal year is less than 20% of Consolidated EBITDA from continuing operations (as defined in the Credit Facility) (the "20% limitation") during the immediately preceding fiscal year. In any event, as long as the liquidity requirements are met, dividends may be declared and paid in any fiscal year up to the amount of dividends permitted and paid in the preceding fiscal year without regard to the 20% limitation.
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, gross	318,750	318,750
Maximum borrowing capacity	500,000
Amount of standby letters of credit	28,606
Current borrowing capacity	152,644
Term Loans Payable [Member] | Term Loan Payable on or Before July 8, 2016 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	231,250	231,250
Notes Payable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	169	246
Maturity date	Oct. 16, 2013
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%
Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 750,000

[1] This Condensed Consolidated Balance Sheet has been derived from the audited Consolidated Balance Sheet as of July 29, 2011, as filed in the Company's Annual Report on Form 10-K for the fiscal year ended July 29, 2011.