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Stock-Based Compensation - Long-Term Incentive Plan Awards (Details) - LTIP PSUs - 2015 SIP - $ / shares
1 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Nov. 30, 2015
Mar. 31, 2019
Mar. 31, 2016
Mar. 31, 2020
2020            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period (in years) 3 years          
Award requisite service period 36 months          
Granted (in shares)           38,174
Granted (in dollars per share)           $ 146.96
2020 | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage 200.00%          
2020 | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Financial performance achievement percentage 90.00%          
2019            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period (in years)   3 years        
Award requisite service period   36 months        
Granted (in shares)       41,793    
Granted (in dollars per share)       $ 120.24    
2019 | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage   200.00%        
2019 | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Financial performance achievement percentage   90.00%        
2016            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period (in years)     3 years      
Award requisite service period     36 months      
Granted (in dollars per share)         $ 50.05  
2016 | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage     200.00%      
Granted (in shares)         308,000  
2016 | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Financial performance achievement percentage     90.00%