Shareholders' Equity, Reclassification Out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Nov. 01, 2013
Amounts reclassified out of AOCL related to interest expense and provision for income taxes [Abstract]
Interest expense	$ 4,424	$ 4,407
Provision for income taxes	16,994	12,670
Interest Rate Swaps [Member]
Amounts reclassified out of AOCL related to interest expense and provision for income taxes [Abstract]
Net of tax	(1,232)
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)
Provision for income taxes	773
Net of tax	$ (1,232)