Debt (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Jan. 30, 2015	May 01, 2015	Aug. 01, 2014
Debt Instrument [Line Items]
Long-term debt, gross		$ 400,000	$ 400,000
Current maturities		0	25,000	[1]
Long-term debt		400,000	375,000	[1]
Prior Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, gross		0	212,500
Line of credit facility, expiration date		Jul. 08, 2016
Maximum borrowing capacity		218,750
Loan acquisition costs written off	412
2015 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, gross		400,000	0
Line of credit facility, expiration date		Jan. 08, 2020
Line of credit facility, term		5 years
Maximum borrowing capacity		750,000
Loan acquisition costs		3,537
Amount of standby letters of credit		11,530
Current borrowing capacity		338,470
Weighted average interest rates of the Company's swapped debt (in hundredths)		3.48%
Restrictions on dividends payable		Under the 2015 Revolving Credit Facility, provided there is no default existing and the total of the Company’s availability under the 2015 Revolving Credit Facility plus the Company’s cash and cash equivalents on hand is at least $100,000 (the “cash availability”), the Company may declare and pay cash dividends on shares of its common stock and repurchase shares of its common stock (1) in an unlimited amount if at the time such dividend or repurchase is made the Company’s consolidated total leverage ratio is 3.00 to 1.00 or less and (2) in an aggregate amount not to exceed $100,000 in any fiscal year if the Company’s consolidated total leverage ratio is greater than 3.00 to 1.00 at the time the dividend or repurchase is made; notwithstanding (1) and (2), so long as immediately after giving effect to the payment of any such dividends, cash availability is at least $100,000, the Company may declare and pay cash dividends on shares of its common stock in an aggregate amount not to exceed in any fiscal year the product of the aggregate amount of dividends declared in the fourth quarter of the immediately preceding fiscal year multiplied by four.
Liquidity requirements		100,000
Dividends threshold		100,000
Leverage ratio, maximum		3.00
Term Loans Payable [Member]
Debt Instrument [Line Items]
Long-term debt, gross		0	187,500
Maturity date		Jul. 08, 2016
Maximum borrowing capacity		$ 181,250

[1] This Condensed Consolidated Balance Sheet has been derived from the audited Consolidated Balance Sheet as of August 1, 2014, as filed with the Securities and Exchange Commission in the Company's Annual Report on Form 10-K for the fiscal year ended August 1, 2014.