Pension and Other Post-retirement Benefit Plans - Summary of Changes in the Fair Value of the Defined Benefit Pension Plan (Details) - Pension - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 10,004	$ 10,268
Actual return on plan assets	2,594	1,099
Employer contributions	4,766	1,176
Benefits paid	(1,128)	(1,120)
Foreign currency exchange rate changes	3,831	(1,361)
Fair value of plan assets at end of year	71,491	10,004
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	580	611
Actual return on plan assets	41	20
Employer contributions	219	198
Benefits paid	(233)	(211)
Foreign currency exchange rate changes	90	(38)
Fair value of plan assets at end of year	$ 697	$ 580