NET INCOME (LOSS) PER SHARE - Schedule of Earnings Per Share, Basic and Diluted (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 24, 2015	Jan. 25, 2014	Jan. 24, 2015	Jan. 25, 2014
Common Class A [Member]
Numerator:
Net income allocated, basic	$ 4,957	$ 2,102	$ 7,870	$ (2,979)
Conversion of Class B to Class A shares	1,492	648	2,370	0
Effect of share-based compensation on allocated net income	9	(1)	11	0
Net income allocated, diluted	6,458	2,749	10,251	(2,979)
Denominator:
Weighted average shares outstanding, basic (in shares)	9,409	9,198	9,409	9,167
Conversion of Class B to Class A shares (in shares)	4,361	4,361	4,361	0
Dilutive effect of share-based compensation (in shares)	25	85	22	0
Weighted average shares outstanding, diluted (in shares)	13,795	13,644	13,792	9,167
Common Class B [Member]
Numerator:
Net income allocated, basic	1,492	648	2,370	(937)
Conversion of Class B to Class A shares	0	0	0	0
Effect of share-based compensation on allocated net income	(2)	0	(2)	0
Net income allocated, diluted	$ 1,490	$ 648	$ 2,368	$ (937)
Denominator:
Weighted average shares outstanding, basic (in shares)	4,361	4,361	4,361	4,387
Conversion of Class B to Class A shares (in shares)	0	0	0	0
Dilutive effect of share-based compensation (in shares)	0	0	0	0
Weighted average shares outstanding, diluted (in shares)	4,361	4,361	4,361	4,387