Income Taxes Unrecognized Tax Benefits Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Beginning Balance	$ 2,327	$ 2,401	$ 2,348
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	161	44	137
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	86	(98)	10
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	134	20	94
Unrecognized Tax Benefits, Ending Balance	$ 2,440	$ 2,327	$ 2,401