Derivative Instruments and Hedging Activities, Amounts Reclassified out of AOCIL Related to Interest Rate Swaps (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 03, 2019	Apr. 27, 2018	May 03, 2019	Apr. 27, 2018
Amounts Reclassified Out of AOCIL Related to Interest Rate Swaps [Abstract]
Interest expense	$ (4,111)	$ (3,594)	$ (12,637)	$ (10,892)
Provision for income taxes	10,560	10,968	32,461	13,663
Net of tax	50,414	$ 48,747	158,376	$ 186,266
Gain (Loss) on Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member]
Amounts Reclassified Out of AOCIL Related to Interest Rate Swaps [Abstract]
Provision for income taxes	(25)		11
Net of tax	74		(32)
Gain (Loss) on Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member]
Amounts Reclassified Out of AOCIL Related to Interest Rate Swaps [Abstract]
Interest expense	$ 99		$ (43)