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STOCK COMPENSATION - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
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 $2,567, $3,230, and $3,139, respectively | $ 7,656 | $ 9,716 | $ 7,878
Tax effects of employee's stock-based compensation expense recognized income | 2,567 | $ 3,230 | $ 3,139
Stock based compensation expense not yet recognized in income | $ 7,500 |  |
Weighted average remaining period for unrecognized stock based compensation | 2 years 6 months 7 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 | 0
Exercised | $ 1,011 | $ 1,842 | $ 1,900
Fair value of share granted (in shares) | 191,372 | 315,802 |
Award vesting period | eight years |  |
Director |  |  |
Effect to income of share-based compensation expense, net of tax benefits [Abstract] |  |  |
Fair value of share granted (in shares) | 800,000 | 1,000,000.0 | 1,100,000

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