Retirement Benefit Plans - Reconciliation of Defined Benefit Pension Plan (Details) - Defined Benefit Pension Plan $ in Thousands	4 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)
Change in benefit obligation:
Benefit obligation at beginning of year	$ 4,482
Interest cost	32	$ 32
Actuarial loss	178
Benefits paid	(639)
Foreign currency impact	(26)
Benefit obligation at end of year	4,027	4,027
Change in plan assets:
Fair value of assets at beginning of year	4,511
Actual return on plan assets	66
Employer contributions	19
Benefits paid	(639)
Foreign currency impact	(28)
Fair value of assets at end of year	3,929	3,929
Funded status at year end	$ (98)	$ (98)