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Incentive Plan (Market Performance Based Awards) (Details)
$ in Millions
1 Months Ended 9 Months Ended
Feb. 27, 2024
Feb. 27, 2023
Feb. 23, 2023
Feb. 27, 2022
Feb. 27, 2021
Feb. 27, 2020
Feb. 27, 2019
Feb. 27, 2017
Jan. 31, 2020
shares
Jan. 31, 2019
shares
Sep. 30, 2020
USD ($)
item
shares
Sep. 30, 2019
USD ($)
2014 Awards                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Performance period                     3 years  
2015 Awards                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Performance period                     3 years  
Market performance-based awards                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Performance period                     3 years  
Number of trials | item                     100,000  
Fair value of awards | $                     $ 17.2 $ 20.3
Award requisite service period                     4 years  
Market performance-based awards | Below Threshold Level                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting percentage                     0.00%  
Performance Threshold                     (500.00%) (300.00%)
Market performance-based awards | Threshold Level                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting percentage                     25.00%  
Performance Threshold                     (500.00%) (300.00%)
Market performance-based awards | Target Level                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting percentage                     50.00%  
Performance Threshold                     0.00% 100.00%
Market performance-based awards | High Level                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting percentage                     100.00%  
Performance Threshold                     500.00% 500.00%
Market performance-based awards | First Vesting Period in February | 2014 Awards                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting percentage               50.00%        
Market performance-based awards | First Vesting Period in February | 2016 Performance Grant                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting percentage           50.00% 50.00%          
Market performance-based awards | First Vesting Period in February | 2017 Performance Grant                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting percentage           50.00%            
Class D Units | 2015 Awards                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting of restricted common units, net (units)                   339,317    
Class D Units | 2017 Performance Grant                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting of restricted common units, net (units)                 137,816      
Distribution Equivalent Unit | High Level | 2015 Awards                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting of restricted common units, net (units)                     31,009  
Distribution Equivalent Unit | High Level | 2017 Performance Grant                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting of restricted common units, net (units)                     10,971  
Restricted Stock Units (RSUs) | 2016 Performance Grant                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting of restricted common units, net (units)                   56,778    
Restricted Stock Units (RSUs) | High Level                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting of restricted common units, net (units)                     29,141  
Scenario, Forecast | Market performance-based awards | First Vesting Period in February | 2018 Awards                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting percentage         50.00%              
Scenario, Forecast | Market performance-based awards | First Vesting Period in February | 2019 Performance Grant                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting percentage   50.00% 50.00% 50.00%                
Scenario, Forecast | Market performance-based awards | Second Vesting Period in February | 2018 Awards                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting percentage       50.00%                
Scenario, Forecast | Market performance-based awards | Second Vesting Period in February | 2019 Performance Grant                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting percentage 50.00%