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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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Net number of share options (or share units) granted during the period.

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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 option holders acquired shares when converting their stock options into shares.

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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- Definition

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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Number of share options (or share units) exercised during the current period.

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Stock-Based Compensation - LTIP NQSOs (Details) - Stock Incentive Plan 2015 - LTIP NQSOs - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Number of Shares
Number of shares outstanding beginning of period (in shares)					361,383	397,340	191,786
Granted (in shares)					0	0	205,554
Forfeited (in shares)						(35,957)
Exercised (in shares)					(58,444)
Number of shares outstanding end of period (in shares)	302,939	361,383	397,340	191,786	302,939	361,383	397,340
Weighted- Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)					$ 65.35	$ 65.70	$ 61.86
Granted (in dollars per share)							69.29
Forfeited (in dollars per share)						(69.29)
Exercised (in dollars per share)					(61.86)
Outstanding at the end of the period (in dollars per share)	$ 66.02	$ 65.35	$ 65.70	$ 61.86	$ 66.02	$ 65.35	$ 65.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted- Average Remaining Contractual Term (Years)	5 years	6 years 2 months 12 days	7 years 1 month 6 days	9 years
Aggregate Intrinsic Value	$ 20,594	$ 29,504	$ 9,666	$ 0	$ 20,594	$ 29,504	$ 9,666