Shareholders' Equity, Reclassification Out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 30, 2015	Jan. 31, 2014	Jan. 30, 2015	Jan. 31, 2014
Amounts reclassified out of AOCL related to interest expense and provision for income taxes [Abstract]
Interest expense	$ 4,684	$ 4,471	$ 9,108	$ 8,878
Provision for income taxes	19,374	17,180	36,368	29,850
Interest Rate Swaps [Member]
Amounts reclassified out of AOCL related to interest expense and provision for income taxes [Abstract]
Net of tax			(2,467)
Interest Rate Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Amounts reclassified out of AOCL related to interest expense and provision for income taxes [Abstract]
Interest expense	(2,005)		(4,016)
Provision for income taxes	773		1,549
Net of tax	$ (1,232)		$ (2,467)