Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
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	0.3		0.1
United Kingdom and Denmark
Defined Contribution Plans and Defined Benefit Plan
Contribution expense associated with defined benefit plan	$ 0.2	0.2	$ 0.1
Maximum | Greece
Defined Contribution Plans and Defined Benefit Plan
Contribution expense associated with defined benefit plan		$ 0.1