Debt (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 01, 2014	Aug. 02, 2013
Debt Instrument [Line Items]
Term of debt instrument	5 years
Long-term debt, gross	$ 400,000	$ 400,000
Current maturities	25,000	0
Long-term debt	375,000	400,000
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	25,000
2016	375,000
Total	400,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	500,000
Long-term debt, gross	212,500	212,500
Line of credit facility, expiration date	Jul. 08, 2016
Long-term Debt, Fiscal Year Maturity [Abstract]
Amount of standby letters of credit	20,637
Current borrowing capacity	266,863
Term Loans Payable [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	250,000
Long-term debt, gross	187,500	187,500
Maturity date	Jul. 08, 2016
Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	750,000
Long-term Debt, Fiscal Year Maturity [Abstract]
Weighted average interest rates of the Company's swapped term loans (in hundredths)	3.73%	3.73%
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. Provided there is no default existing and 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 and repurchase shares of its common stock if the aggregate amount of dividends paid and shares repurchased in any fiscal year is less than the sum of (1) 20% of Consolidated EBITDA from continuing operations (as defined in the Credit Facility) (the “20% limitation”) and (2) provided the Company’s consolidated total leverage ratio is 3.25 to 1.00 or less, $100,000 (less the amount of any share repurchases during the current 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.
Dividend limitation (in hundredths)	20.00%
Liquidity requirements	$ 100,000
Leverage ratio	3.25