SHARE BASED COMPENSATION - Schedule of Activity of the RSUs Granted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Time-based grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	220
Units granted, weighted average grant date fair value (in dollars per share)	$ 68.36
Fair Value at Grant Date	$ 14,700
Time-based grants | Vesting in less than 12 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	60
Units granted, weighted average grant date fair value (in dollars per share)	$ 69.10
Fair Value at Grant Date	$ 4,100
Time-based grants | Vesting in more than 12 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	160
Units granted, weighted average grant date fair value (in dollars per share)	$ 68.08
Fair Value at Grant Date	$ 10,600
Performance-based grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	260
Units granted, weighted average grant date fair value (in dollars per share)	$ 67.36
Fair Value at Grant Date	$ 17,830
Total grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	480	550	330
Units granted, weighted average grant date fair value (in dollars per share)	$ 67.81	$ 52.22	$ 95.30
Fair Value at Grant Date	$ 32,500	$ 28,600	$ 32,300