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, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 63,902	$ 71,491
Actual return on plan assets	(543)	1,165
Employer contributions	10,208	7,882
Benefits paid	(5,153)	(1,096)
Foreign currency exchange rate changes	487	(3,161)
Fair value of plan assets at end of year	61,201	63,902
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	642	697
Actual return on plan assets	18	20
Employer contributions	226	233
Benefits paid	(241)	(247)
Foreign currency exchange rate changes	(16)	(61)
Fair value of plan assets at end of year	$ 629	$ 642