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NET INCOME PER SHARE - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Oct. 30, 2021
Oct. 24, 2020
Common Class A    
Numerator:    
Net income allocated, basic $ 5,538 $ 2,526
Conversion of Class B to Class A shares 1,566 716
Net income allocated, diluted $ 7,104 $ 3,242
Denominator:    
Weighted average shares outstanding, basic (in shares) 9,864 9,850
Conversion of Class B to Class A shares (in shares) 4,294 4,294
Weighted average shares outstanding, diluted (in shares) 14,158 14,144
Common Class B    
Numerator:    
Net income allocated, basic $ 1,566 $ 716
Conversion of Class B to Class A shares 0 0
Net income allocated, diluted $ 1,566 $ 716
Denominator:    
Weighted average shares outstanding, basic (in shares) 4,294 4,294
Conversion of Class B to Class A shares (in shares) 0 0
Weighted average shares outstanding, diluted (in shares) 4,294 4,294