Derivative Instruments and Hedging Activities, Offsetting of Derivative Assets Liabilities (Details) - USD ($) $ in Thousands	Apr. 29, 2016	Jul. 31, 2015
Offsetting of derivative liabilities in condensed consolidated balance sheets [Abstract]
Estimated pre-tax portion of AOCL that is expected to be reclassified into earnings over the next twelve months	$ 3,475
Interest Rate Swaps [Member]
Offsetting of derivative assets in condensed consolidated balance sheets [Abstract]
Gross Asset Amounts	0	$ 3,878
Liability Amount Offset	0	(119)
Net Asset Amount Presented in the Balance Sheets	0	3,759
Offsetting of derivative liabilities in condensed consolidated balance sheets [Abstract]
Gross Liability Amounts	17,570	9,821
Asset Amount Offset	0	0
Net Liability Amount Presented in the Balance Sheets	17,570	9,821
Reduction in fair value of interest rate swap assets and liabilities due to adjustment related to non-performance risk	$ 831	$ 209