Pension and Other Post-retirement Benefit Plans - Summary of Change in Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2017	Mar. 31, 2016
Pension
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Net Periodic Benefit Cost Recurring Activity	$ 2,750	$ 3,185	$ 2,900
Change in Benefit Obligation
Benefit obligation at beginning of the year	45,716	49,342
Service cost	1,298	1,507	1,286
Interest cost	1,297	1,347	1,819
Plan participants’ contributions	0	0
Plan amendments	0	342
Actuarial (gain) loss	1,980	(4,922)
Foreign currency exchange rate change	(3,732)	221
Gross benefits paid	(1,120)	(1,425)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	(268)	(696)
Benefit obligation at end of year	45,171	45,716	49,342
Change in Plan Assets
Fair value of plan assets at beginning of year	10,268	10,483
Actual return on plan assets	1,099	(46)
Foreign currency exchange rate changes	(1,361)	(242)
Employer contributions	1,176	1,528
Settlements	(58)	(30)
Plan participants’ contributions	0	0
Gross benefits paid	(1,120)	(1,425)
Fair value of plan assets at end of year	10,004	10,268	10,483
Funded status at end of year
Fair value of plan assets	10,268	10,483	10,483	$ 10,004	$ 10,268
Benefit obligations	(45,716)	(49,342)	(49,342)	(45,171)	(45,716)
Amount recognized at end of year				(35,167)	(35,448)
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	1,600
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Net Periodic Benefit Cost Recurring Activity	(196)	(172)	(158)
Change in Benefit Obligation
Benefit obligation at beginning of the year	623	846
Service cost	0	0	0
Interest cost	11	19	29
Plan participants’ contributions	592	464
Plan amendments	0	0
Actuarial (gain) loss	(228)	(146)
Foreign currency exchange rate change	0	0
Gross benefits paid	(612)	(560)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0	0
Benefit obligation at end of year	386	623	846
Change in Plan Assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Foreign currency exchange rate changes	0	0
Employer contributions	20	96
Settlements	0	0
Plan participants’ contributions	592	464
Gross benefits paid	(612)	(560)
Fair value of plan assets at end of year	0	0	0
Funded status at end of year
Fair value of plan assets	0	0	0	0	0
Benefit obligations	(623)	$ (846)	$ (846)	(386)	(623)
Amount recognized at end of year				$ (386)	$ (623)
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	$ 53