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STOCK COMPENSATION - Narrative and Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Effect to income of share-based compensation expense, net of tax benefits [Abstract] |  |  |
Total employee stock-based compensation expense recognized in income, net of tax effects of $3,907, $192, and $66, respectively | $ 9,716 | $ 7,878 | $ 6,486
Tax effects of employee's stock-based compensation expense recognized income | 3,230 | $ 3,139 | $ 3,907
Stock based compensation expense not yet recognized in income | $ 11,900 |  |
Weighted average remaining period for unrecognized stock based compensation | 3 years 25 days |  |
Period that options are issued | 10 years |  |
Percentage of options vesting at either grant date or over four year period | 100.00% |  |
Period that options vest | 4 years |  |
Granted (in shares) | 0 | 0 |
Fair value of share granted (in shares) | 315,802 | 354,108 |
Award vesting | P8Y |  |
Director |  |  |
Effect to income of share-based compensation expense, net of tax benefits [Abstract] |  |  |
Fair value of share granted (in shares) | 1,000,000.0 | 1,100,000 | 500,000

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