Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 01, 2013	Jan. 27, 2012	Feb. 01, 2013	Jan. 27, 2012	Aug. 03, 2012
Class of Stock [Line Items]
Proceeds from exercise of share-based compensation awards			$ 2,622	$ 2,137
Cash dividends declared (in dollars per share)	$ 0.50	$ 0.25	$ 1.00	$ 0.50
Unrealized loss in the fair value of interest rate swaps, net of tax			7,721
Accumulated change in fair value of interest rate swaps, net of tax	13,437		13,437		21,158	[1]
Share-based compensation expense			5,409
Tax benefit realized upon exercise of share-based compensation awards			$ 1,289
Common Stock [Member]
Class of Stock [Line Items]
Exercise of share-based compensation awards (in shares)			255,784
Cash dividends paid (in dollars per share)			$ 0.90

[1] This Condensed Consolidated Balance Sheet has been derived from the audited Consolidated Balance Sheet as of August 3, 2012, as filed in the Company's Annual Report on Form 10-K for the fiscal year ended August 3, 2012.