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SHARE BASED COMPENSATION - Schedule of Activity of the RSUs Granted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Time-based grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	150
Units granted, weighted average grant date fair value (in dollars per share)	$ 80.95
Fair Value at Grant Date	$ 11.9
Time-based grants | Vesting in less than 12 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	40
Units granted, weighted average grant date fair value (in dollars per share)	$ 86.28
Fair Value at Grant Date	$ 3.4
Time-based grants | Vesting in more than 12 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	110
Units granted, weighted average grant date fair value (in dollars per share)	$ 79.02
Fair Value at Grant Date	$ 8.5
Performance-based grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	180
Units granted, weighted average grant date fair value (in dollars per share)	$ 86.16
Fair Value at Grant Date	$ 15.7
Total grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	330	480	550
Units granted, weighted average grant date fair value (in dollars per share)	$ 83.84	$ 67.81	$ 52.22
Fair Value at Grant Date	$ 27.6	$ 32.5	$ 28.6

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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