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EQUITY - Share-Based Awards, Additional Information (Details) - USD ($) shares in Millions, $ in Millions | 2 Months Ended | 12 Months Ended
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Nov. 22, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items] |  |  |  |
Common share available for issue under share-based plan (in shares) |  | 5.6 |  |
Common shares were available to underlie the grant of new share-based award (in shares) |  | 3.2 |  |
Tax benefit realized from tax deduction associated with exercise of stock options and vesting of restricted share awards |  | $ (1.5) | $ 14.8 | $ 18.3
Treasury Shares |  |  |  |
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items] |  |  |  |
Treasury shares reissued (in shares) |  | 1.3 | 1.5 | 0.5
Share-Based Compensation Awards and Employee Stock Purchase Plan | Treasury Shares |  |  |  |
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items] |  |  |  |
Treasury shares reissued (in shares) |  | 0.4 | 0.9 | 0.4
Restricted Stock Units, Performance Shares, And Stock Options | Subsequent Event |  |  |  |
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items] |  |  |  |
Options and equity instruments other than options, grants in period (in shares) | 1.5 |  |  |
Options and equity instruments other than options, grants in period, fair value | $ 29.8 |  |  |

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