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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, 2021
Sep. 30, 2020
Sep. 30, 2019
Time-Based Grants      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted (in shares) 0.2    
Units granted, weighted average grant date fair value (in dollars per share) $ 76.04    
Units granted, fair value at grant date $ 17.4    
Time-Based Grants | Vesting in less than 24 months      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted (in shares) 0.1    
Units granted, weighted average grant date fair value (in dollars per share) $ 77.25    
Units granted, fair value at grant date $ 9.6    
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) $ 74.57    
Units granted, fair value at grant date $ 7.8    
Performance-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) $ 77.26    
Units granted, fair value at grant date $ 27.5    
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) $ 93.08    
Units granted, fair value at grant date $ 4.9    
Performance-Based Grants | Vesting in more than 24 months      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted (in shares) 0.3    
Units granted, weighted average grant date fair value (in dollars per share) $ 74.54    
Units granted, fair value at grant date $ 22.6    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted (in shares) 0.6 0.9 1.5
Units granted, weighted average grant date fair value (in dollars per share) $ 76.78 $ 61.72 $ 53.11
Units granted, fair value at grant date $ 44.9 $ 55.6 $ 81.4
SB/RH | Time-Based Grants      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted (in shares) 0.2    
Units granted, weighted average grant date fair value (in dollars per share) $ 76.11    
Units granted, fair value at grant date $ 15.8    
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) 0.1    
Units granted, weighted average grant date fair value (in dollars per share) $ 77.65    
Units granted, fair value at grant date $ 8.0    
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) $ 74.57    
Units granted, fair value at grant date $ 7.8    
SB/RH | Performance-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) $ 77.26    
Units granted, fair value at grant date $ 27.5    
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) $ 93.08    
Units granted, fair value at grant date $ 4.9    
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) 0.3    
Units granted, weighted average grant date fair value (in dollars per share) $ 74.54    
Units granted, fair value at grant date $ 22.6    
SB/RH | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted (in shares) 0.6 0.9 1.5
Units granted, weighted average grant date fair value (in dollars per share) $ 76.83 $ 61.68 $ 52.82
Units granted, fair value at grant date $ 43.3 $ 54.3 $ 79.8