Derivative Instruments and Hedging Activities, Pre-tax Effects of Derivative Instruments on AOCL and Income (Details) - Interest Rate Swaps [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 29, 2016	Jan. 30, 2015	Jan. 29, 2016	Jan. 30, 2015	Jul. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income Recognized in AOCL on Derivatives (Effective Portion)			$ 9,930		$ 1,641
Ineffectiveness recorded in earnings on interest rate cash flow hedge			0	$ 0
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from AOCL into Income (Effective Portion)	$ 1,444	$ 2,005	$ 2,891	$ 4,016