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ACCOUNTING PRONOUNCEMENTS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction to income tax expense |  |  |  | $ 1,234 |  |  |  |  | $ 1,234 |  |
Diluted (in dollars per share) | $ 0.60 | $ 0.91 | $ 0.46 | $ 0.32 | $ 0.74 | $ 0.73 | $ 0.43 | $ 0.14 | $ 2.28 | $ 2.03 | $ 1.91
Accounting Standards Update 2016-09 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per share) |  |  |  | $ 0.04 |  |  |  |  | $ 0.04 |  |

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