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STOCKHOLDERS' EQUITY AND EQUITY COMPENSATION (Details) - Summary of stock-based compensation expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Stockholders' Equity Note [Abstract] |  |  |
Pre-tax compensation expense | $ 13,285 | $ 10,078 | $ 8,090
Tax benefit | (2,115) | (2,036) | (2,836)
Total stock-based compensation expense, net of tax | $ 11,170 | $ 8,042 | $ 5,254

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