Stock Compensation - LTIP NQSOs (Details) - LTIP NQSOs - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Number of Shares
Number of shares outstanding beginning of period (in shares)	397,340
Forfeited (in shares)	(35,957)
Number of shares outstanding end of period (in shares)	361,383	397,340
Weighted- Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 65.70
Forfeited (in dollars per share)	69.29
Outstanding at the end of the period (in dollars per share)	$ 65.35	$ 65.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Remaining Contractual Term (Years)	6 years 2 months 12 days	7 years 1 month 6 days
Aggregate Intrinsic Value	$ 29,504	$ 9,666
2017 \| Stock Incentive Plan 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Award vesting period (in years)	9 years
2018 \| Stock Incentive Plan 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Award vesting period (in years)	7 years

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Number of non-vested options outstanding.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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