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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Stock options outstanding | 0 |  |
Future income tax benefit from compensation expense recognized |  | $ 1,720 | $ 418
Proceeds from the exercise of stock options | $ 14 | 6,406 | 4,015
All Plans |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Total stock-based compensation cost | 14,562 | 10,612 | 9,097
Future income tax benefit from compensation expense recognized | 5,534 | 4,139 | 3,548
Proceeds from the exercise of stock options | 14 | 6,406 | 4,015
Tax benefit realized from options exercised | $ 3 | $ 932 | 350
Options vested (in shares) | 0 | 0 |
All Plans | Stock Options |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Stock options outstanding | 0 | 77,733 |
Intrinsic value of options exercised | $ 9 | $ 2,692 | $ 931
All Plans | Restricted Stock |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Unrecognized compensation cost on unvested awards | $ 7,205 |  |
Weighted average period of recognition of unrecognized compensation cost on non-vested awards | 1 year 6 months |  |
All Plans | Restricted Stock | Prior to Fiscal Year 2013 | After 3 Years |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 50.00% |  |
All Plans | Restricted Stock | Prior to Fiscal Year 2013 | After 4 Years |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 16.67% |  |
All Plans | Restricted Stock | Prior to Fiscal Year 2013 | After 5 Years |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 16.67% |  |
All Plans | Restricted Stock | Prior to Fiscal Year 2013 | After 6 Years |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 16.66% |  |
All Plans | Restricted Stock | Fiscal 2013 and Thereafter | After 3 Years |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 50.00% |  |
All Plans | Restricted Stock | Minimum |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Expiration period (in years) | 3 years |  |
All Plans | Restricted Stock | Maximum |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Expiration period (in years) | 5 years |  |
2012 Equity Incentive Plan |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Term of plan (in years) | 10 years |  |
Maximum number of shares available for grants or awards (in shares) | 2,500,000 |  |
Shares reserved for future issuance under award plan (in shares) | 589,238 |  |
Retirement Eligible Employees |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Total stock-based compensation cost | $ 3,337 |  |
Pre-defined Levels of Adjusted Earnings Per Share | Restricted Stock | Fiscal 2013 and Thereafter | After 4 Years |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 8.33% |  |
Pre-defined Levels of Adjusted Earnings Per Share | Restricted Stock | Fiscal 2013 and Thereafter | After 5 Years |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 8.33% |  |
Pre-defined Levels of Adjusted Earnings Per Share | Restricted Stock | Fiscal 2013 and Thereafter | After 6 Years |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 8.33% |  |
Pre-defined Levels of Appreciation in the Market Value of Common Stock | Restricted Stock | Fiscal 2013 and Thereafter | After 4 Years |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 8.33% |  |
Pre-defined Levels of Appreciation in the Market Value of Common Stock | Restricted Stock | Fiscal 2013 and Thereafter | After 5 Years |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 8.33% |  |
Pre-defined Levels of Appreciation in the Market Value of Common Stock | Restricted Stock | Fiscal 2013 and Thereafter | After 6 Years |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 8.33% |  |
Director Fee Plans |  |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |
Shares deferred under the director fee plan (in shares) | 16,139 |  |
Value of annual stock-based grant | $ 125 |  |
Option awards outstanding and vested (in shares) | 0 |  |
Total restricted stock awards granted to date (in shares) | 161,724 |  |
Restricted stock awards unvested (in shares) | 25,157 |  |
Director Fee Plans | Stock Options |  |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |
Total stock options granted to date (in shares) | 22,300 |  |
2014 Director Fee Plan |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Shares reserved for future issuance under award plan (in shares) | 150,000 |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |
Annual retainer fee paid to non-employee directors | $ 75 |  |
Annual retainer fee paid to non-employee chairman of the board | $ 175 |  |
Total restricted stock awards granted to date (in shares) | 58,574 |  |

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