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Equity-Based Compensation - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Total Unvested
Unvested at beginning of period (in shares)	662,076
Granted (in shares)	118,859
Vested (in shares)	(311,586)
Forfeited (in shares)	(27,834)
Unvested at end of period (in shares)	441,515	662,076
Weighted- Average Grant-Date Fair Value of Award
Unvested at beginning of period (in dollars per share)	$ 26.58
Granted (in dollars per share)	54.71
Vested (in dollars per share)	22.40
Forfeited (in dollars per share)	30.29
Unvested at end of period (in dollars per share)	$ 36.87	$ 26.58
2017 Equity Incentive Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Weighted- Average Grant-Date Fair Value of Award
Granted (in dollars per share)	$ 54.71	$ 40.77	$ 32.45
Fair value of restricted stock, vested	$ 18,141	$ 16,601	$ 16,214
Total unrecognized compensation expense relating to restricted stock	$ 15,838
Weighted-average amortization period of restricted stock	2 years 10 months 28 days
Tax benefit recognized from share-based compensation	$ 1,229	$ 2,537	$ 2,403

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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