Debt Interest Rates at Period End (Details)	9 Months Ended	12 Months Ended
	Apr. 23, 2016	Jul. 25, 2015
Standby Letters of Credit
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate at Period End	1.75%	1.75%
Credit Agreement - Term Loan (matures April 2020)
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate at Period End	2.42%	1.94%
Credit Agreement - Revolving facility (matures April 2020)
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate at Period End	2.26%	2.02%
Unutilized commitment fee (in percent)	0.35%	0.35%