STOCK-BASED COMPENSATION - Stock Option Awards Activity (Details) (Stock Option Awards, USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Sep. 30, 2014
Stock Option Awards
Stock Options
Outstanding at September 30, 2013 (in shares)	133,500
Granted (in shares)	0
Exercised (in shares)	(53,750)
Forfeited (in shares)	0
Expired (in shares)	0
Outstanding at September 30, 2014 (in shares)	79,750
Fully Vested and Expected to Vest at September 30, 2014 (in shares)	79,750
Exercisable at September 30, 2014 (in shares)	79,750
Weighted Average Exercise Price
Outstanding at September 30, 2013 (in dollars per share)	$ 31.87
Granted (in dollars per share)	$ 0.00
Exercised (in dollars per share)	$ 31.07
Forfeited (in dollars per share)	$ 0.00
Expired (in dollars per share)	$ 0.00
Outstanding at September 30, 2014 (in dollars per share)	$ 32.42
Fully Vested and Expected to Vest at September 30, 2014 (in dollars per share)	$ 32.42
Exercisable at September 30, 2014 (in dollars per share)	$ 32.42
Stock Options (Additional Information)
Outstanding at End of Period, weighted average remaining contractual term - stock options (in years)	1 year 1 month 18 days
Fully Vested and Expected to Vest at End of Period, weighted average remaining contractual term - stock options (in years)	1 year 1 month 18 days
Exercisable at End of Period, weighted average remaining contractual term - stock options (in years)	1 year 1 month 18 days
Outstanding Ending Balance, aggregate intrinsic value - stock options	$ 1.1
Fully Vested and Expected to Vest at End of Period, aggregate intrinsic value - stock options	1.1
Exercisable at End of Period, aggregate intrinsic value - stock options	$ 1.1

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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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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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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 difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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