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STOCK-BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 USD ($) tranche component $ / shares shares | Sep. 30, 2020 shares
2016 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted (in shares) | 0 | 0
Stock options outstanding (in shares) | 2,700,000 |
Exercisable (in shares) | 2,500,000 |
Stock options outstanding (in dollars per share) | $ / shares | $ 63.34 |
Exercisable at the end of the period (in dollars per share) | $ / shares | $ 63.57 |
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Period over which awards expire | 10 years |
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years | 4 years
Unrecognized compensation cost related to unvested awards | $ | $ 28.0 |
Weighted-average compensation cost recognition period | 2 years |
Restricted Stock | 2020 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted (in shares) | 700,982 |
Performance Share Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
Unrecognized compensation cost related to unvested awards | $ | $ 9.5 |
Weighted-average compensation cost recognition period | 1 year 10 months 24 days |
Number of components included in award units | component | 2 |
Performance Share Units | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of units vested | 0.00% |
Performance Share Units | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of units vested | 200.00% |
Performance Share Units | 2020 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted (in shares) | 312,600 |
First Component of Performance Share Unit |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Performance cycle period of each tranche | 3 years |
Second Component of Performance Share Unit |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Period over which awards expire | 3 years |
Performance cycle period of each tranche | 1 year |
Number of tranches in component | tranche | 3 |

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