Derivative Instruments and Hedging Activities, Pre-Tax Effects of Derivative Instruments on AOCL and Income (Details) - Interest Rate Swap [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Aug. 01, 2014	Aug. 02, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income Recognized in AOCL on Derivative (Effective Portion)	$ 1,641	$ 3,058	$ 23,620
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from AOCL into Income (Effective Portion)	$ 8,052	$ 8,068	$ 20,773