Employee Benefit Plans - Defined Contribution Plans (Details Textual) - 401(k) Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, matching contribution cost recognized	$ 1.8	$ 1.6	$ 1.7
100% on first 1% [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contributions, percent of one dollar match for employee percentage match	100.00%
50% up to next 5% [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contributions, percent of one dollar match for employee percentage match	50.00%