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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% |  |  |

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