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, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 71,491	$ 10,004
Actual return on plan assets	1,165	2,594
Employer contributions	7,882	4,766
Benefits paid	(1,096)	(1,128)
Foreign currency exchange rate changes	(3,161)	3,831
Fair value of plan assets at end of year	63,902	71,491
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	697	580
Actual return on plan assets	20	41
Employer contributions	233	219
Benefits paid	(247)	(233)
Foreign currency exchange rate changes	(61)	90
Fair value of plan assets at end of year	$ 642	$ 697