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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2021
Sep. 30, 2019
Aug. 31, 2021
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted (in shares)         0  
Award requisite service period     36 months      
Stock Appreciation Rights            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)         0  
Annual RSUs and Annual PSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock compensation expense       $ 17,361 $ 17,361  
Annual RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)         37,764 34,211
Award vesting period         3 years  
Weighted-average grant date fair value (in dollars per share)         $ 386.69 $ 200.83
Annual PSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)         0  
LTIP PSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares) 19,890 38,174   26,347    
Award vesting period     3 years      
Unrecognized stock compensation expense       $ 20,351 $ 20,351  
Measurement period     3 years      
Weighted-average grant date fair value (in dollars per share)       $ 435.94    
LTIP PSUs | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting rights percentage     200.00%      
LTIP PSUs | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Financial performance achievement percentage     100.00%