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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Common Stock, Voting Rights, Number of Votes Per Common Share

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Common Stock Voting Rights, Percentage of Voting Power

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Dividends, Common Stock, Cash, Percent Class A is Entitled Greater than Class B

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Number of Classes of Common Stock

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Number of Share-Based Compensation Plans

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SHAREHOLDERS’ EQUITY - Additional Information (Details)	12 Months Ended
SHAREHOLDERS’ EQUITY - Additional Information (Details)	Jul. 31, 2021 USD ($) class_common_stock vote plan shares	Jul. 25, 2020 USD ($) 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	$ 2,522,000	$ 2,958,000
Income tax benefit recognized	$ 633,000	202,000
Weighted-average remaining contractual term of options outstanding	2 years 7 months 6 days
Aggregate intrinsic value of options outstanding	$ 0
Aggregate intrinsic value of options exercisable	0
Fair value of restricted shares vested	363,000	5,968,000
Unrecognized compensation costs related to nonvested stock options and restricted stock granted	$ 4,172,000
Weighted-average period of compensation cost expected to be recognized	1 year 7 months 6 days
2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining for future grants (in shares) \| shares	1,078,000
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
Authorized amount remaining in share repurchase program	$ 3,203,000	3,203,000
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