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Stock-based Compensation - Schedule of Number of RSU Awards Granted by Award Type (Parenthetical) (Details)
shares in Thousands
9 Months Ended
Jun. 30, 2022
Installment
shares
Performance-Based Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 3 years
Number of equal annual installments | Installment 3
Granted, shares 89
Performance-Based Restricted Stock Units | Maximum | Catch-Up Provision  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, shares 165
Performance-Based Restricted Stock Units | Maximum Two Times | Maximum | Catch-Up Provision  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of RSUs two times
Service-Based Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of equal annual installments | Installment 3
Granted, shares 1,320
TSR Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, shares 76
TSR Units | Maximum | Catch-Up Provision  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, shares 152
Percentage of number of RSUs 100.00%
TSR Units | Maximum Two Times | Maximum | Catch-Up Provision  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of RSUs two times