Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Nov. 01, 2013
Shareholders' Equity [Abstract]
Common stock issued resulting from vesting of share-based compensation awards and stock option exercises (in shares)	83,945
Adjustments related to tax withholding and stock issued for share based compensation awards	$ 4,719
Share-based compensation expense	2,735
Tax benefit realized upon exercise of share-based compensation awards	1,963
Dividends [Line Items]
Cash dividends declared (in dollars per share)	$ 1.00	$ 0.75
Cash dividends paid (in dollars per share)	$ 1.00
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss, net of tax	(476)	(78)
Interest Rate Swaps [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCL, Beginning balance	(4,733)
Other comprehensive income before reclassifications	756
Amounts reclassified from AOCL	(1,232)
Other comprehensive loss, net of tax	(476)
AOCL, Ending balance	$ (5,209)
First Declaration of Dividends [Member]
Dividends [Line Items]
Cash dividends declared (in dollars per share)	$ 1.00
Dividend payment date	Nov. 05, 2014
Dividend record date	Oct. 17, 2014