CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Jul. 31, 2021	Jul. 25, 2020
Preferred stock shares authorized (in shares)	10,000,000	10,000,000
Preferred stock shares issued (in shares)	0	0
Class A Common Stock
Common stock shares authorized (in shares)	20,000,000	20,000,000
Common stock shares issued (in shares)	10,978,000	10,985,000
Treasury stock shares (in shares)	726,000	726,000
Class B Common Stock
Common stock shares authorized (in shares)	20,000,000	20,000,000
Common stock shares issued (in shares)	4,294,000	4,294,000
Common stock shares outstanding (in shares)	4,294,000	4,294,000