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EQUITY-BASED INCENTIVE AWARDS: (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
EQUITY-BASED INCENTIVE AWARDS: |  |
Number of shares of the company's common stock permitted for issuance under the plan | 150,000 |
Number of shares awarded pursuant to the plan | 146,600 |
Number of shares that may be awarded under the plan | 3,400 |
Stock options issued and outstanding |  |
Weighted-Average Exercise Price (in dollars per share) |  | $ 65.97
Weighted Average Exercise Price |  |
Outstanding at the end of the period (in dollars per share) |  | $ 65.97
Stock Options |  |
Omnibus plan and stock option activity |  |
Granted (in shares) | 0 | 8,000
Share Based Compensation Arrangement by Share Based Payment Award Options Grants in Period Grant Date Fair Value |  | $ 0.1
Stock Option Pricing Assumptions |  |
Risk-free interest rate (as a percent) |  | 1.46%
Dividend yield (as a percent) |  | 1.10%
Expected volatility (as a percent) |  | 25.00%
Expected life |  | 6 years
Stock options issued and outstanding |  |
Number Outstanding (in shares) | 41,600 | 45,000
Weighted-Average Exercise Price (in dollars per share) | $ 33.69 | $ 35.28
Number Exercisable (in shares) | 31,200 |
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 25.35 |
Number of Shares |  |
Outstanding at the beginning of the period (in shares) | 45,000 |
Granted (in shares) | 0 | 8,000
Exercised (in shares) | (2,600) |
Forfeited/ Expired (in shares) | (800) |
Outstanding at the end of the period (in shares) | 41,600 | 45,000
Weighted Average Exercise Price |  |
Outstanding at beginning of the period (in dollars per share) | $ 35.28 |
Exercised (in dollars per share) | $ 53.87 |
Forfeited/ Expired (in dollars per share) | $ 57.78 |
Outstanding at the end of the period (in dollars per share) | $ 33.69 | $ 35.28
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 | 0.1 |
Amortization period of unamortized compensation expense | 27 months |
Aggregate intrinsic value of options outstanding | 2.1 | 2.1
Aggregate intrinsic value of options exercisable | 1.8 | 1.7
Total fair value of options vested | 0.4 | 0.2
Expiration period | 10 years |
Stock Options | Minimum |  |
Omnibus plan and stock option activity |  |
Vesting period | 3 years |
Stock Options | Maximum |  |
Omnibus plan and stock option activity |  |
Vesting period | 5 years |
Aggregate intrinsic value and fair value of options outstanding |  |
Total intrinsic value of options | $ 0.1 | $ 0.1
Stock Options | Fiscal 2007 |  |
Stock options issued and outstanding |  |
Number Outstanding (in shares) | 25,000 |
Remaining Weighted-Average Contractual Life | 2 years 2 months 12 days |
Weighted-Average Exercise Price (in dollars per share) | $ 18.00 |
Number Exercisable (in shares) | 25,000 |
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 18.00 |
Number of Shares |  |
Outstanding at the end of the period (in shares) | 25,000 |
Weighted Average Exercise Price |  |
Outstanding at the end of the period (in dollars per share) | $ 18.00 |
Stock Options | Fiscal 2010 |  |
Stock options issued and outstanding |  |
Number Outstanding (in shares) | 4,000 |
Remaining Weighted-Average Contractual Life | 5 years 6 months 29 days |
Weighted-Average Exercise Price (in dollars per share) | $ 51.50 |
Number Exercisable (in shares) | 3,000 |
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 51.50 |
Number of Shares |  |
Outstanding at the end of the period (in shares) | 4,000 |
Weighted Average Exercise Price |  |
Outstanding at the end of the period (in dollars per share) | $ 51.50 |
Stock Options | Fiscal 2012 |  |
Stock options issued and outstanding |  |
Number Outstanding (in shares) | 5,400 |
Remaining Weighted-Average Contractual Life | 7 years 1 month 2 days |
Weighted-Average Exercise Price (in dollars per share) | $ 54.93 |
Number Exercisable (in shares) | 1,800 |
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 55.15 |
Number of Shares |  |
Outstanding at the end of the period (in shares) | 5,400 |
Weighted Average Exercise Price |  |
Outstanding at the end of the period (in dollars per share) | $ 54.93 |
Stock Options | Fiscal 2012 | Minimum |  |
Stock options issued and outstanding |  |
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 53.80 |
Stock Options | Fiscal 2012 | Maximum |  |
Stock options issued and outstanding |  |
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 65.97 |
Stock Options | Fiscal 2013 |  |
Stock options issued and outstanding |  |
Number Outstanding (in shares) | 7,200 |
Remaining Weighted-Average Contractual Life | 8 years 26 days |
Weighted-Average Exercise Price (in dollars per share) | $ 62.33 |
Number Exercisable (in shares) | 1,400 |
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 62.33 |
Number of Shares |  |
Outstanding at the end of the period (in shares) | 7,200 |
Weighted Average Exercise Price |  |
Outstanding at the end of the period (in dollars per share) | $ 62.33 |

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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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration