Derivative Instruments and Hedging Activities, Amounts Reclassified out of AOCL Related to Interest Rate Swaps (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jul. 31, 2015	May. 01, 2015	Jan. 30, 2015	Oct. 31, 2014	Aug. 01, 2014	May. 02, 2014	Jan. 31, 2014	Nov. 01, 2013	Jul. 31, 2015	Aug. 01, 2014	Aug. 02, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									$ (16,679)	$ (17,557)	$ (35,742)
Provision for income taxes									(74,298)	(58,721)	(48,517)
Net of tax	$ 47,399	$ 35,317	$ 47,163	$ 34,024	$ 39,185	$ 28,728	$ 37,055	$ 27,160	163,903	132,128	$ 117,265
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes									3,105	3,111
Net of tax									(4,947)	(4,957)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Interest Rate Swap [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									$ (8,052)	$ (8,068)