CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Jul. 29, 2017	Jul. 30, 2016
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)	10,562,000	10,192,000
Treasury stock shares (in shares)	477,000	343,000
Class B Common Stock
Common stock shares authorized (in shares)	20,000,000	20,000,000
Common stock shares issued (in shares)	4,304,000	4,319,000
Common Stock, Shares, Outstanding	4,319,000	4,319,000