Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Nov. 02, 2012	Oct. 28, 2011	Aug. 03, 2012
Class of Stock [Line Items]
Proceeds from exercise of share-based compensation awards	$ 2,322	$ 823
Cash dividends declared (in dollars per share)	$ 0.50	$ 0.25
Unrealized loss in the fair value of interest rate swaps, net of tax	3,414
Accumulated change in fair value of interest rate swaps, net of tax	17,744		21,158	[1]
Share-based compensation expense	1,869
Tax benefit realized upon exercise of share-based compensation awards	$ 1,274
Common Stock [Member]
Class of Stock [Line Items]
Exercise of share-based compensation awards (in shares)	203,956
Cash dividends paid (in dollars per share)	$ 0.40
Cash dividends declared (in dollars per share)	$ 0.50

[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.