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Stock-Based Compensation - Narrative (Details)
12 Months Ended
Oct. 31, 2016
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation   $ 36,000,000 $ 15,000,000 $ 20,000,000
Income tax benefit recognized for share-based compensation arrangements   $ 0 $ 0 $ 0
Conversion ratio (in shares) 0.1      
Stock options granted (in shares) | shares   0 0 0
Option exercised in period, intrinsic value   $ 7,000,000 $ 1,000,000 $ 5,000,000
Payments made in conjunction with exercise of SARs   $ 2,000,000    
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Unrecognized compensation related to unvested share arrangements   $ 18,000,000    
Recognition period for unrecognized compensation cost   1 year 8 months 12 days    
Granted (in shares) | shares   548,458    
Performance shares (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation related to unvested share arrangements   $ 14,000,000    
Recognition period for unrecognized compensation cost   2 years    
Performance period   3 years    
Granted (in shares) | shares   379,629    
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period   10 years    
Stock options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   2 years    
Stock options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Stock appreciation rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) | shares   0    
Payments made in conjunction with exercise of SARs   $ 2,000,000 $ 1,000,000 $ 1,000,000