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Stock-Based Compensation - Long-Term Incentive Plan Awards (Details) - $ / shares
1 Months Ended 12 Months Ended
Mar. 31, 2021
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Measurement period       3 years    
2021 | LTIP PSUs | 2015 SIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)       19,890    
Granted (in dollars per share)       $ 376.45    
2021 | LTIP PSUs | 2015 SIP | Share-based Payment Arrangement, Tranche One            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period 2 years          
Award requisite service period 24 months          
2021 | LTIP PSUs | 2015 SIP | Share-based Payment Arrangement, Tranche Two            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period 3 years          
Award requisite service period 36 months          
2021 | Maximum | LTIP PSUs | 2015 SIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage 200.00%          
2021 | Minimum | LTIP PSUs | 2015 SIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Financial performance achievement percentage 100.00%          
2020 | LTIP PSUs | 2015 SIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period   3 years        
Award requisite service period   36 months        
Granted (in shares)         38,174  
Granted (in dollars per share)         $ 146.96  
2020 | Maximum | LTIP PSUs | 2015 SIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage   200.00%        
2020 | Minimum | LTIP PSUs | 2015 SIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Financial performance achievement percentage   90.00%        
2019 | LTIP PSUs | 2015 SIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     3 years      
Award requisite service period     36 months      
Granted (in shares)           41,793
Granted (in dollars per share)           $ 120.24
2019 | Maximum | LTIP PSUs | 2015 SIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage     200.00% 200.00%    
2019 | Minimum | LTIP PSUs | 2015 SIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Financial performance achievement percentage     90.00%