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EQUITY-BASED INCENTIVE AWARDS - Stock Options (Details) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 USD ($) item $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares
Omnibus plan and stock option activity |  |
Number of incentive plans | item | 2 |
Stock options issued and outstanding |  |
Number Outstanding (in shares) | 36,450 |
Weighted-Average Exercise Price (in dollars per share) | $ / shares | $ 78.67 |
Stock Options |  |
Omnibus plan and stock option activity |  |
Expiration period | 10 years | 10 years
Vesting period | 5 years | 5 years
Estimated fair value of the stock option awards using the Black-Scholes option pricing model | $ | $ 0.2 | $ 0.2
Stock Option Pricing Assumptions |  |
Risk-free interest rate (as a percent) | 2.55% | 2.41%
Dividend yield (as a percent) | 0.80% | 0.80%
Expected volatility (as a percent) | 45.10% | 33.00%
Expected life | 6 years | 6 years
Stock options issued and outstanding |  |
Number Outstanding (in shares) | 36,450 | 33,800
Weighted-Average Exercise Price (in dollars per share) | $ / shares | $ 78.67 | $ 77.85
Number Exercisable (in shares) | 19,200 |
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ / shares | $ 71.01 |
Number of Shares |  |
Granted (in shares) | 5,450 | 6,000
Exercised (in shares) | (2,800) |
Weighted Average Exercise Price |  |
Granted (in dollars per share) | $ / shares | $ 84.00 |
Exercised (in dollars per share) | $ / shares | $ 79.22 |
Aggregate intrinsic value and fair value of options outstanding |  |
Compensation expense related to the amortization of all equity - based compensation awards | $ | $ 0.1 | $ 0.1
Total unamortized compensation expense | $ | $ 0.3 |
Amortization period of unamortized compensation expense | 38 months |
Aggregate intrinsic value of options outstanding | $ | $ 0.2 | 0.4
Aggregate intrinsic value of options exercisable | $ | 0.2 | 0.3
Total intrinsic value of options | $ | 0.1 | 0.1
Total fair value of options vested | $ | $ 0.4 | $ 0.4
Omnibus Plan |  |
Omnibus plan and stock option activity |  |
Number of shares of the company's common stock permitted for issuance under the plan | 135,000 |
Number of shares awarded pursuant to the plan | 87,132 |
Number of additional shares that may be awarded under the plan | 47,868 |

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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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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