Derivative Instruments and Hedging Activities, Offsetting of Derivative Liabilities (Details) - USD ($) $ in Thousands	Oct. 28, 2016	Jul. 29, 2016
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	$ 3,138
Interest Rate Swaps [Member]
Offsetting of derivative liabilities in condensed consolidated balance sheets [Abstract]
Gross liability amounts	16,144	$ 22,250
Asset amount offset	0	0
Net liability amount presented in the balance sheets	16,144	22,250
Reduction in fair value of interest rate swap assets and liabilities due to adjustment related to non-performance risk	$ 587	$ 1,035