Pension and Other Post-retirement Benefit Plans - Summary of Change in Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2016	Mar. 31, 2015
Pension
Change in Benefit Obligation
Benefit obligation at beginning of the year	$ 49,342	$ 42,715
Service cost	1,507	1,286	$ 1,308
Interest cost	1,347	1,819	1,734
Plan participants' contributions	0	0
Plan amendments	342	1,006
Actuarial (gain) loss	(4,922)	13,673
Foreign currency exchange rate change	221	(9,988)
Gross benefits paid	(1,425)	(1,111)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	696	58
Benefit obligation at end of year	45,716	49,342	42,715
Change in Plan Assets
Fair value of plan assets at beginning of year	10,483	9,946
Actual return on plan assets	(46)	1,737
Foreign currency exchange rate changes	(242)	(1,353)
Employer contributions	1,528	1,303
Settlements	(30)	(39)
Plan participants' contributions	0	0
Gross benefits paid	(1,425)	(1,111)
Fair value of plan assets at end of year	10,268	10,483	9,946
Funded status at end of year
Fair value of plan assets	10,483	9,946	9,946	$ 10,268	$ 10,483
Benefit obligations	(49,342)	(42,715)	(42,715)	(45,716)	(49,342)
Amount recognized at end of year				(35,448)	(38,859)
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	1,700
Other Benefits
Change in Benefit Obligation
Benefit obligation at beginning of the year	846	785
Service cost	0	0	0
Interest cost	19	29	23
Plan participants' contributions	464	474
Plan amendments	0	0
Actuarial (gain) loss	(146)	118
Foreign currency exchange rate change	0	0
Gross benefits paid	(560)	(560)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0	0
Benefit obligation at end of year	623	846	785
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	96	86
Settlements	0	0
Plan participants' contributions	464	474
Gross benefits paid	(560)	(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	(846)	$ (785)	$ (785)	(623)	(846)
Amount recognized at end of year				$ (623)	$ (846)
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	$ 83