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EQUITY-BASED INCENTIVE AWARDS - Omnibus Plans and Stock Options (Details) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 USD ($) item $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares
EQUITY-BASED INCENTIVE AWARD |  |
Number of incentive plans | item | 2 |
Stock options issued and outstanding |  |
Number Outstanding (in shares) | shares | 34,350 |
Weighted-Average Exercise Price (in dollars per share) | $ / shares | $ 80.33 |
Omnibus Plans |  |
EQUITY-BASED INCENTIVE AWARD |  |
Number of shares of the company's common stock permitted for issuance under the plan | shares | 135,000 |
Number of shares awarded pursuant to the plan | shares | 101,280 |
Number of additional shares that may be awarded under the plan | shares | 33,720 |
Stock Options |  |
EQUITY-BASED INCENTIVE AWARD |  |
Awards issued (in shares) | shares | 0 | 5,450
Vesting period | 5 years | 5 years
Estimated fair value of the stock option awards using the Black-Scholes option pricing model | $ |  | $ 0.2
Stock Option Pricing Assumptions |  |
Risk-free interest rate (as a percent) |  | 2.55%
Dividend yield (as a percent) |  | 0.80%
Expected volatility (as a percent) |  | 45.10%
Expected life |  | 6 years
Stock options issued and outstanding |  |
Expiration period | 10 years | 10 years
Number Outstanding (in shares) | shares | 34,350 | 36,450
Weighted-Average Exercise Price (in dollars per share) | $ / shares | $ 80.33 | $ 78.67
Number Exercisable (in shares) | shares | 22,890 |
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ / shares | $ 72.67 |
Number of Shares |  |
Granted (in shares) | shares | 0 | 5,450
Exercised (in shares) | shares | (2,100) |
Weighted Average Exercise Price |  |
Exercised (in dollars per share) | $ / shares | $ 51.50 |
Aggregate intrinsic value and fair value of options outstanding |  |
Compensation expense | $ | $ 0.1 | $ 0.1
Total unamortized compensation expense | $ | $ 0.2 |
Amortization period of unamortized compensation expense | 29 months |
Aggregate intrinsic value of options outstanding | $ |  | 0.2
Aggregate intrinsic value of options exercisable | $ |  | 0.2
Total fair value of options vested | $ | $ 0.4 | 0.4
Stock Options | Maximum |  |
Aggregate intrinsic value and fair value of options outstanding |  |
Aggregate intrinsic value of options outstanding | $ | 0.1 |
Aggregate intrinsic value of options exercisable | $ | 0.1 |
Total intrinsic value of options exercised | $ | $ 0.1 | $ 0.1

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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