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SHAREHOLDERS’ EQUITY - Additional Information (Details)	12 Months Ended
SHAREHOLDERS’ EQUITY - Additional Information (Details)	Jul. 25, 2020 USD ($) class_common_stock vote plan shares	Jul. 27, 2019 USD ($) shares	Sep. 30, 2019 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	2
Non-cash share-based compensation	$ 2,958,000	$ 3,098,000
Income tax benefit recognized	$ 202,000	729,000
Weighted-average remaining contractual term of options outstanding	2 years 8 months 12 days
Aggregate intrinsic value of options outstanding	$ 7,000
Aggregate intrinsic value of options exercisable	7,000
Intrinsic value of options exercised		87,000
Fair value of restricted shares vested	5,968,000	1,161,000
Unrecognized compensation costs related to nonvested stock options and restricted stock granted	$ 6,919,000
Weighted-average period of compensation cost expected to be recognized	2 years 8 months 12 days
Proceeds from exercise of stock options	$ 0	1,007,000
Actual tax benefit realized		34,000
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining for future grants (in shares) \| shares	0
2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining for future grants (in shares) \| shares	1,017,000
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	$ 2,482,000	846,000
Authorized amount remaining in share repurchase program	$ 3,203,000	685,000
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 A Common Stock \| 2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized \| shares	1,200,000
Class A Common Stock \| 2016 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]
Number of shares repurchased	$ 1,907,000	$ 224,000