EARNINGS PER COMMON SHARE - Additional Information (Details) - shares shares in Millions |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Weighted average number of shares outstanding, diluted (in shares) | 55.5 | 57.2 | 56.9 |
| Dilutive potential Common Shares (in shares) | 0.0 | 1.5 | 1.2 |
| Number of common shares covered by out-of-the-money stock options (in shares) | 0.6 | ||
| Options | |||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | |||
| Number of common shares covered by out-of-the-money stock options (in shares) | 0.2 | 0.1 | 0.0 |