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Stock-Based Compensation - Summary of Stock and Stock Unit Award Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested balance at September 30, 2020 16,949    
Granted 6,146    
Vested (4,119)    
Forfeited/canceled (1,142)    
Modified 0    
Nonvested balance at September 30, 2021 17,834 16,949  
Nonvested beginning balance, Weighted Average Grant Date Fair Value $ 24.30    
Weighted Average Grant Date Fair Value of shares granted 21.08 $ 23.05 $ 30.75
Weighted Average Grant Date Fair Value of shares vested 26.56    
Weighted Average Grant Date Fair Value of shares forfeited/canceled 30.61    
Nonvested ending balance, Weighted Average Grant Date Fair Value $ 22.27 $ 24.30  
Time-Based Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested balance at September 30, 2020 12,141    
Granted 5,906    
Vested (3,500)    
Forfeited/canceled (570)    
Modified 199    
Nonvested balance at September 30, 2021 14,176 12,141  
Performance-Based Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested balance at September 30, 2020 4,808    
Granted 240    
Vested (619)    
Forfeited/canceled (572)    
Modified (199)    
Nonvested balance at September 30, 2021 3,658 4,808