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SHARE BASED COMPENSATION - Summary of Activity of the RSUs Granted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Time-Based Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	270
Units granted, weighted average grant date fair value (in dollars per share)	$ 53.60
Units granted, fair value at grant date	$ 14.5
Time-Based Grants | Vesting in less than 12 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	130
Units granted, weighted average grant date fair value (in dollars per share)	$ 56.66
Units granted, fair value at grant date	$ 7.3
Time-Based Grants | Vesting in more than 12 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	140
Units granted, weighted average grant date fair value (in dollars per share)	$ 50.85
Units granted, fair value at grant date	$ 7.2
Performance-Based Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	280
Units granted, weighted average grant date fair value (in dollars per share)	$ 50,870,000
Units granted, fair value at grant date	$ 14.1
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	550	330	590
Units granted, weighted average grant date fair value (in dollars per share)	$ 52.22	$ 95.30	$ 76.78
Units granted, fair value at grant date	$ 28.6	$ 32.3	$ 44.9
SB/RH | Time-Based Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	240
Units granted, weighted average grant date fair value (in dollars per share)	$ 54.08
Units granted, fair value at grant date	$ 13.0
SB/RH | Time-Based Grants | Vesting in less than 12 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	100
Units granted, weighted average grant date fair value (in dollars per share)	$ 58.76
Units granted, fair value at grant date	$ 5.8
SB/RH | Time-Based Grants | Vesting in more than 12 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	140
Units granted, weighted average grant date fair value (in dollars per share)	$ 50.85
Units granted, fair value at grant date	$ 7.2
SB/RH | Performance-Based Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	280
Units granted, weighted average grant date fair value (in dollars per share)	$ 50,870,000
Units granted, fair value at grant date	$ 14.1
SB/RH | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	520	320	560
Units granted, weighted average grant date fair value (in dollars per share)	$ 52.36	$ 95.24	$ 76.83
Units granted, fair value at grant date	$ 27.1	$ 31.2	$ 43.3

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- Definition

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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