Pension and Other Post-retirement Benefit Plans - Summary of Change in Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2018	Mar. 31, 2017
Funded status at end of year
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months				$ 9,023
Defined Benefit Plan, Expected Future Benefit Payment, Year Two				7,469
Defined Benefit Plan, Expected Future Benefit Payment, Year Three				7,534
Defined Benefit Plan, Expected Future Benefit Payment, Year Four				10,148
Defined Benefit Plan, Expected Future Benefit Payment, Year Five				9,098
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter				57,816
Pension
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	$ 184	$ (1,229)	$ 5,125
Change in Benefit Obligation
Benefit obligation at beginning of the year	45,171	45,716
Service cost	4,585	1,298	1,507
Interest cost	1,750	1,297	1,347
Plan participants’ contributions	0	0
Actuarial (gain) loss	437	1,980
Foreign currency exchange rate change	9,934	(3,732)
Gross benefits paid	(1,128)	(1,120)
Curtailments and settlements	(5,642)	(268)
Defined Benefit Plan, Benefit Obligation, Business Combination	106,566	0
Benefit obligation at end of year	161,673	45,171	45,716
Change in Plan Assets
Fair value of plan assets at beginning of year	10,004	10,268
Actual return on plan assets	2,594	1,099
Foreign currency exchange rate changes	3,831	(1,361)
Employer contributions	4,766	1,176
Settlements	(5,659)	(58)
Plan participants’ contributions	0	0
Gross benefits paid	1,128	1,120
Acquisitions	57,083	0
Fair value of plan assets at end of year	71,491	10,004	10,268
Funded status at end of year
Fair value of plan assets	10,004	10,268	10,268	71,491	$ 10,004
Benefit obligations	(45,171)	(45,716)	(45,716)	(161,673)	(45,171)
Amount recognized at end of year				(90,182)	(35,167)
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months				8,968
Defined Benefit Plan, Expected Future Benefit Payment, Year Two				7,417
Defined Benefit Plan, Expected Future Benefit Payment, Year Three				7,487
Defined Benefit Plan, Expected Future Benefit Payment, Year Four				10,105
Defined Benefit Plan, Expected Future Benefit Payment, Year Five				9,059
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter				57,685
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(322)	(619)	(698)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0	0	342
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	87	82	60
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	(593)	528	(5,541)
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax	4,195	3,267	(2,356)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(64)	228	146
Change in Benefit Obligation
Benefit obligation at beginning of the year	386	623
Service cost	0	0	0
Interest cost	12	11	19
Plan participants’ contributions	536	592
Actuarial (gain) loss	64	(228)
Foreign currency exchange rate change	0	0
Gross benefits paid	(631)	(612)
Curtailments and settlements	0	0
Defined Benefit Plan, Benefit Obligation, Business Combination	0	0
Benefit obligation at end of year	367	386	623
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	95	20
Settlements	0	0
Plan participants’ contributions	536	592
Gross benefits paid	631	612
Acquisitions	0	0
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	(386)	(623)	(623)	(367)	(386)
Amount recognized at end of year				(367)	$ (386)
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months				55
Defined Benefit Plan, Expected Future Benefit Payment, Year Two				52
Defined Benefit Plan, Expected Future Benefit Payment, Year Three				47
Defined Benefit Plan, Expected Future Benefit Payment, Year Four				43
Defined Benefit Plan, Expected Future Benefit Payment, Year Five				39
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter				$ 131
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	191	208	191
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	255	(20)	45
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax	$ 76	$ (216)	$ (127)