EQUITY - Stock Options, Additional Information (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items] | |||
| Intrinsic value of stock options exercised | $ 41,800,000 | $ 21,900,000 | |
| Cash received from exercise of stock options | $ 3,300,000 | $ 15,200,000 | $ 17,600,000 |
| Options | |||
| Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items] | |||
| Compensation costs not yet recognized, net | $ 1,400,000 | ||
| Expected weighted average period for unrecognized compensation cost (in years) | 1 year 3 months 18 days | ||