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v3.25.3

STOCK-BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2025 USD ($) tranche component $ / shares shares | Sep. 30, 2024 USD ($) shares | Sep. 30, 2023 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Income tax benefits related to stock-based compensation expense | $ | $ 7.1 | $ 7.1 | $ 7.4
2016 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted (in shares) | 0 | 0 | 0
Stock options outstanding (in shares) | 1,500,000 |  |
Stock options outstanding (in dollars per share) | $ / shares | $ 62.40 |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period over which awards expired | 10 years |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Unrecognized compensation cost related to unvested awards | $ | $ 29.7 |  |
Weighted-average compensation cost recognition period | 1 year 10 months 24 days |  |
Restricted Stock | 2024 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted (in shares) | 881,809 |  |
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 | $ | $ 10.6 |  |
Weighted-average compensation cost recognition period | 1 year 10 months 24 days |  |
Number of components included in award units | component | 2 |  |
Increase or decrease in award percentage | 25.00% |  |
Performance Share Units | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting of units (in percent) | 0.00% |  |
Performance Share Units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting of units (in percent) | 200.00% |  |
Performance Share Units | 2024 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted (in shares) | 254,655 |  |
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 expired | 3 years |  |
Performance cycle period of each tranche | 1 year |  |
Number of tranches in component | tranche | 3 |  |

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