Derivative Instruments and Hedging Activities, Offsetting of Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Aug. 01, 2014
Offsetting of derivative liabilities in consolidated balance sheets [Abstract]
Net Liability Amount Presented in the Balance Sheets	$ 9,821	$ 7,943
Estimated pre-tax portion of AOCL that is expected to be reclassified into earnings over the next twelve months	3,866
Interest Rate Swap [Member]
Offsetting of derivative assets in balance sheets [Abstract]
Gross Asset Amounts	3,878	240
Liability Amount Offset	(119)	0
Net Asset Amount Presented in the Balance Sheets	3,759	240
Offsetting of derivative liabilities in consolidated balance sheets [Abstract]
Gross Liability Amounts	9,821	8,441
Asset Amount Offset	0	(498)
Net Liability Amount Presented in the Balance Sheets	9,821	7,943
Reduction in the fair value	209	62
Other Assets [Member] | Interest Rate Swap [Member]
Offsetting of derivative assets in balance sheets [Abstract]
Net Asset Amount Presented in the Balance Sheets	3,759	240
Current Interest Rate Swap Liability [Member] | Interest Rate Swap [Member]
Offsetting of derivative liabilities in consolidated balance sheets [Abstract]
Net Liability Amount Presented in the Balance Sheets	1,117	4,704
Long-term Interest Rate Swap Liability [Member] | Interest Rate Swap [Member]
Offsetting of derivative liabilities in consolidated balance sheets [Abstract]
Net Liability Amount Presented in the Balance Sheets	$ 8,704	$ 3,239