Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, maximum annual contributions per employee, percent	75.00%
Defined contribution plan, maximum annual bonus contributions per employee, percent	100.00%
Deferred compensation	$ 5,905	$ 6,086
Cash surrender value of life insurance	9,546	8,890
401(k) Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, contributions by employer	5,206	4,205	$ 2,735
Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, contributions by employer	$ 71	$ 66	$ 65