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Stock Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
LTIP NQSOs | Stock Incentive Plan 2015          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares)       0  
Annual RSUs | Stock Incentive Plan 2015          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years)       3 years  
Granted (in shares)       38,307 59,235
Weighted-average grant date fair value (in dollars per share)       $ 173.65 $ 115.65
Annual PSUs | Stock Incentive Plan 2015          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years)       3 years  
Granted (in shares)       19,938 31,320
Weighted-average grant date fair value (in dollars per share)       $ 174.36 $ 116.34
Annual RSUs and Annual PSUs | Stock Incentive Plan 2015          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock compensation expense   $ 13,593 $ 13,593 $ 13,593  
Granted (in shares)       58,245 90,555
Weighted-average grant date fair value (in dollars per share)       $ 173.89 $ 115.89
LTIP PSUs | 2015 SIP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock compensation expense   $ 10,147 $ 10,147 $ 10,147  
2007 LTIP SARs | Stock Incentive Plan 2015          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)       0  
Subsequent Event | Annual RSUs | Stock Incentive Plan 2015          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) 0        
Subsequent Event | Annual PSUs | Stock Incentive Plan 2015          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) 0        
2020 | LTIP PSUs | 2015 SIP          
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    
Weighted-average grant date fair value (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%