Employee Benefits - Fair Value of Plan Assets (Details) - Estimate of Fair Value - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Non-U.S. Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 833	$ 19,749
U.S. equities / equity funds	5,791	0
International equities / equity funds	9,266	5,208
Global equity funds	7,915	6,000
U.S. fixed income funds	4,162
U.S. fixed income funds	11,517	6,040
Diversified funds	21,707	20,201
Real estate and other	1,915
Total	63,106	57,198
Non-U.S. Plans | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	833	19,749
U.S. equities / equity funds	5,791	0
International equities / equity funds	3,728	0
Global equity funds	1,437	0
U.S. fixed income funds	4,162
U.S. fixed income funds	2,879	0
Diversified funds	0	0
Real estate and other	0
Total	18,830	19,749
Non-U.S. Plans | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
U.S. equities / equity funds	0	0
International equities / equity funds	5,538	5,208
Global equity funds	6,478	6,000
U.S. fixed income funds	0
U.S. fixed income funds	8,638	6,040
Diversified funds	21,707	20,201
Real estate and other	0
Total	42,361	37,449
Non-U.S. Plans | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
U.S. equities / equity funds	0	0
International equities / equity funds	0	0
Global equity funds	0	0
U.S. fixed income funds	0
U.S. fixed income funds	0	0
Diversified funds	0	0
Real estate and other	0
Total	0	0
Pension Plan | U.S. Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1,745	1,342
U.S. equities / equity funds	8,835	7,649
International equities / equity funds	3,923	4,997
U.S. fixed income funds	7,411	7,251
U.S. fixed income funds	1,071	1,028
Diversified funds	10,888	10,496
Real estate and other	3,786	4,124
Total	37,659	36,887
Pension Plan | U.S. Plans | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1,271	851
U.S. equities / equity funds	8,835	7,649
International equities / equity funds	3,923	4,997
U.S. fixed income funds	7,411	7,251
U.S. fixed income funds	1,071	1,028
Diversified funds	10,888	10,463
Real estate and other	0	0
Total	33,399	32,239
Pension Plan | U.S. Plans | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	474	491
U.S. equities / equity funds	0	0
International equities / equity funds	0	0
U.S. fixed income funds	0	0
U.S. fixed income funds	0	0
Diversified funds	0	0
Real estate and other	0	0
Total	474	491
Pension Plan | U.S. Plans | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
U.S. equities / equity funds	0	0
International equities / equity funds	0	0
U.S. fixed income funds	0	0
U.S. fixed income funds	0	0
Diversified funds	0	0
Real estate and other	0	0
Total	$ 0	$ 0