Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Defined Contribution Plans and Defined Benefit Plan
Compensation expense associated with safe harbor contributions	$ 0.1	$ 0.1	$ 0.1
Greece
Defined Contribution Plans and Defined Benefit Plan
Contribution expense associated with defined benefit plan	0.1	0.1	0.1
United Kingdom and Denmark
Defined Contribution Plans and Defined Benefit Plan
Contribution expense associated with defined benefit plan	$ 0.1	$ 0.1	$ 0.1