Employee Benefit Plans - 401 (k) Plan (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Aggregate cash surrender value of underlying life insurance, net of policy loans	$ 0.9	$ 0.9
Present value of future proceeds to be received under corporate life insurance policies, liability	0.1	0.1
401(k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, matching contribution cost recognized	$ 1.6	$ 1.7	$ 1.4
401(k) Plan [Member] | 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%
401(k) Plan [Member] | 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%
Defined contribution plan, employer matching contributions, percent of employee's pre-tax contributions	50.00%