Employee Benefits - Net Periodic Pension Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 280	$ 250
Interest cost	2,818	2,863
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	183	226
Interest cost	1,496	1,728
Pension Plan | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	280	250	$ 1,434
Interest cost	2,818	2,863	3,640
Expected return on plan assets	(2,382)	(2,578)	(3,070)
Amortization of actuarial losses	1,102	1,136	1,809
Amortization of prior service cost	40	40	136
Curtailment gain	0	0	1,062
Special termination benefits	0	0	0
Effects of settlement	0	1,363	0
Net periodic pension cost (benefit)	1,858	3,074	5,011
Pension Plan | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	183	226	271
Interest cost	1,496	1,728	2,146
Expected return on plan assets	(2,817)	(2,760)	(3,110)
Amortization of actuarial losses	952	905	1,388
Amortization of prior service cost	3	(1)	1
Curtailment gain	0	0	0
Special termination benefits	9	14	0
Effects of settlement	0	91	0
Net periodic pension cost (benefit)	$ (174)	$ 203	$ 696