SHAREHOLDERS’ EQUITY - Dividends declared and paid (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 28, 2018	Jul. 29, 2017
Aggregate:
Total common stock dividends paid	$ 12,878	$ 12,788
Class A Common Stock
Per share:
Common stock dividends paid (in dollars per share)	$ 1.000	$ 1.000
Aggregate:
Common stock dividends paid	$ 10,080	$ 9,983
Class B Common Stock
Per share:
Common stock dividends paid (in dollars per share)	$ 0.650	$ 0.650
Aggregate:
Common stock dividends paid	$ 2,798	$ 2,805