SHAREHOLDERS’ EQUITY - Dividends declared and paid (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 25, 2015
Aggregate:
Total common stock dividends paid	$ 12,788	$ 12,634	$ 12,577
Class A Common Stock
Per share:
Common stock dividends paid (in dollars per share)	$ 1.000	$ 1.000	$ 1.000
Aggregate:
Common stock dividends paid	$ 9,983	$ 9,827	$ 9,749
Class B Common Stock
Per share:
Common stock dividends paid (in dollars per share)	$ 0.650	$ 0.650	$ 0.650
Aggregate:
Common stock dividends paid	$ 2,805	$ 2,807	$ 2,828