SHAREHOLDERS’ EQUITY - Additional Information (Details)	12 Months Ended
	Jul. 28, 2018 USD ($) class_common_stock plan vote shares	Jul. 29, 2017 USD ($) shares	Jul. 30, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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
Number of share-based compensation plans | plan	3
Non-cash share-based compensation	$ 3,715,000	$ 3,134,000
Income tax benefit recognized	$ 1,005,000	802,000
Weighted-average remaining contractual term of options outstanding	4 years 7 months 6 days
Aggregate intrinsic value of options outstanding	$ 241,000
Aggregate intrinsic value of options exercisable	241,000
Intrinsic value of options exercised	17,000	204,000
Fair value of restricted shares vested	458,000	6,649,000
Unrecognized compensation costs related to nonvested stock options and restricted stock granted	$ 5,274,000
Weighted-average period of compensation cost expected to be recognized	1 year 7 months 6 days
Proceeds from exercise of stock options	$ 225,000	812,000
Actual tax benefit realized	$ 5,000	83,000
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
Number of shares repurchased	$ 632,000	$ 1,859,000
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
Shares remaining for future grants (in shares) | shares	120,000
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]
Number of shares repurchased	$ 2,222,000