SHAREHOLDERS’ EQUITY - Dividends declared and paid (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 27, 2019	Jul. 28, 2018
Aggregate:
Total common stock dividends paid	$ 12,890	$ 12,878
Class A Common Stock
Per share:
Common stock dividends paid (in dollars per share)	$ 1.000	$ 1.000
Aggregate:
Common stock dividends paid	$ 10,096	$ 10,080
Class B Common Stock
Per share:
Common stock dividends paid (in dollars per share)	$ 0.650	$ 0.650
Aggregate:
Common stock dividends paid	$ 2,794	$ 2,798