SHAREHOLDERS’ EQUITY - Dividends declared and paid (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020
Aggregate:
Total common stock dividends paid	$ 13,050	$ 12,965
Class A Common Stock
Per share:
Common stock dividends paid (in dollars per share)	$ 1.00	$ 1.00
Aggregate:
Common stock dividends paid	$ 10,259	$ 10,174
Class B Common Stock
Per share:
Common stock dividends paid (in dollars per share)	$ 0.65	$ 0.65
Aggregate:
Common stock dividends paid	$ 2,791	$ 2,791