SHAREHOLDERS’ EQUITY - Additional Information (Details)	9 Months Ended	12 Months Ended
	Apr. 23, 2016 USD ($)	Jul. 29, 2017 USD ($) class_common_stock plan vote $ / shares shares	Jul. 30, 2016 USD ($) $ / shares shares	Jul. 25, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value		$ 2,000
Number of common stock classes | class_common_stock		2
Common stock cash dividends, percent Class A is entitled greater than Class B		54.00%
Preferred stock shares authorized (in shares) | shares		10,000,000	10,000,000
Preferred stock shares issued (in shares) | shares		0	0
Stock Repurchased During Period, Value		$ 1,859,000
Number of share-based compensation plans | plan		3
Compensation cost charged against income		$ 3,134,000	$ 3,195,000	$ 3,169,000
Income tax benefit recognized		$ 802,000	$ 1,131,000	1,134,000
Weighted-average remaining contractual term of options outstanding		4 years 9 months 6 days
Weighted-average remaining contractual term of options exercisable		4 years 8 months 4 days
Aggregate intrinsic value of options outstanding		$ 2,000
Weighted-average grant date fair value of options granted | $ / shares		$ 4.79	$ 4.32
Intrinsic value of options exercised		$ 204,000	$ 70,000	1,090,000
Fair value of restricted shares vested		4,117,000	549,000	576,000
Unrecognized compensation costs related to nonvested stock options and restricted stock granted		$ 8,685,000
Weighted-average period of compensation cost expected to be recognized		31 months 2 days
Cash received from option exercises under share-based compensation arrangements		$ 812,000	813,000	2,392,000
Actual tax benefit realized		$ 83,000	$ 29,000	424,000
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of votes entitled per share | vote		1
Authorized amount of share repurchase program				$ 5,000,000
Stock Repurchased During Period, Value	$ 978,000
Class A Common Stock | 2004 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized | shares		1,200,000
Vesting period		3 years
Expiration period		10 years
Shares remaining for future grants (in shares) | shares		0
Class A Common Stock | 2004 Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Class A Common Stock | 2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized | shares		1,200,000
Vesting period		3 years
Expiration period		10 years
Class A Common Stock | 2010 Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of votes entitled per share | vote		10
Percentage of voting power (greater than)		50.00%
Withholding In Satisfaction Of Taxes On Vested Equity Award [Member] | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchased During Period, Value		$ 2,222,000