NET INCOME (LOSS) PER SHARE - Schedule of Earnings Per Share, Basic and Diluted (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 25, 2015	Apr. 26, 2014	Apr. 25, 2015	Apr. 26, 2014
Common Class A [Member]
Numerator:
Net income allocated, basic	$ 9,936	$ 2,395	$ 17,806	$ (595)
Conversion of Class B to Class A shares	2,976	720	5,346	0
Effect of share-based compensation on allocated net income	26	0	37	0
Net income allocated, diluted	12,938	3,115	23,189	(595)
Denominator:
Weighted average shares outstanding, basic (in shares)	9,449	9,288	9,423	9,207
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)	107	30	50	0
Weighted average shares outstanding, diluted (in shares)	13,917	13,679	13,834	9,207
Common Class B [Member]
Numerator:
Net income allocated, basic	2,976	720	5,346	(205)
Conversion of Class B to Class A shares	0	0	0	0
Effect of share-based compensation on allocated net income	(19)	0	(21)	0
Net income allocated, diluted	$ 2,957	$ 720	$ 5,325	$ (205)
Denominator:
Weighted average shares outstanding, basic (in shares)	4,361	4,361	4,361	4,378
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	4,378