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Share Based Compensation - Summary of Activity of the RSUs Granted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Time-Based Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.4
Units granted, weighted average grant date fair value (in dollars per share)	$ 62.48
Units granted, fair value at grant date	$ 27.0
Time-Based Grants | Vesting in less than 24 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.3
Units granted, weighted average grant date fair value (in dollars per share)	$ 62.33
Units granted, fair value at grant date	$ 18.6
Time-Based Grants | Vesting in more than 24 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.1
Units granted, weighted average grant date fair value (in dollars per share)	$ 62.80
Units granted, fair value at grant date	$ 8.4
Performance-Based Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.5
Units granted, weighted average grant date fair value (in dollars per share)	$ 61.03
Units granted, fair value at grant date	$ 28.6
Performance-Based Grants | Vesting in less than 24 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.1
Units granted, weighted average grant date fair value (in dollars per share)	$ 53.19
Units granted, fair value at grant date	$ 4.8
Performance-Based Grants | Vesting in more than 24 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.4
Units granted, weighted average grant date fair value (in dollars per share)	$ 62.88
Units granted, fair value at grant date	$ 23.8
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.9	1.5	0.4
Units granted, weighted average grant date fair value (in dollars per share)	$ 61.72	$ 53.11	$ 102.96
Units granted, fair value at grant date	$ 55.6	$ 81.4	$ 45.9
SB/RH | Time-Based Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.4
Units granted, weighted average grant date fair value (in dollars per share)	$ 62.43
Units granted, fair value at grant date	$ 25.7
SB/RH | Time-Based Grants | Vesting in less than 24 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.3
Units granted, weighted average grant date fair value (in dollars per share)	$ 62.25
Units granted, fair value at grant date	$ 17.3
SB/RH | Time-Based Grants | Vesting in more than 24 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.1
Units granted, weighted average grant date fair value (in dollars per share)	$ 62.80
Units granted, fair value at grant date	$ 8.4
SB/RH | Performance-Based Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.5
Units granted, weighted average grant date fair value (in dollars per share)	$ 61.03
Units granted, fair value at grant date	$ 28.6
SB/RH | Performance-Based Grants | Vesting in less than 24 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.1
Units granted, weighted average grant date fair value (in dollars per share)	$ 53.19
Units granted, fair value at grant date	$ 4.8
SB/RH | Performance-Based Grants | Vesting in more than 24 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.4
Units granted, weighted average grant date fair value (in dollars per share)	$ 62.88
Units granted, fair value at grant date	$ 23.8
SB/RH | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	0.9	1.5	0.4
Units granted, weighted average grant date fair value (in dollars per share)	$ 61.68	$ 52.82	$ 102.92
Units granted, fair value at grant date	$ 54.3	$ 79.8	$ 44.4

X

- 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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