Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of tax benefit from exercise of stock options granted under share-based compensation 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 cash inflow from exercise of stock options granted under share-based compensation arrangement.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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. 27, 2019 USD ($) class_common_stock plan vote shares	Jul. 28, 2018 USD ($) 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	3
Non-cash share-based compensation	$ 3,098,000	$ 3,715,000
Income tax benefit recognized	$ 729,000	1,005,000
Weighted-average remaining contractual term of options outstanding	3 years 8 months 12 days
Aggregate intrinsic value of options outstanding		1,000
Aggregate intrinsic value of options exercisable	$ 1,000
Intrinsic value of options exercised	87,000	17,000
Fair value of restricted shares vested	$ 1,161,000	458,000
Unrecognized compensation costs related to nonvested stock options and restricted stock granted		2,297,000
Weighted-average period of compensation cost expected to be recognized	8 months 12 days
Proceeds from exercise of stock options	$ 1,007,000	225,000
Actual tax benefit realized	$ 34,000	5,000
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 remaining in share repurchase program	$ 685,000
Number of shares repurchased	$ 846,000	$ 632,000
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	$ 224,000
Subsequent Event \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized amount of share repurchase program			$ 5,000,000