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. 29, 2016	Apr. 29, 2016	Jan. 29, 2016	Oct. 30, 2015	Jul. 31, 2015	May 01, 2015	Jan. 30, 2015	Oct. 31, 2014	Jul. 29, 2016	Jul. 31, 2015	Aug. 01, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									$ (14,052)	$ (16,679)	$ (17,557)
Provision for income taxes									(77,120)	(74,298)	(58,721)
Net of tax	$ 51,023	$ 49,169	$ 48,242	$ 40,865	$ 47,399	$ 35,317	$ 47,163	$ 34,024	189,299	163,903	132,128
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									2,063	3,105	3,111
Net of tax									(3,332)	(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									$ (5,395)	$ (8,052)	$ (8,068)