Pension and Other Post-retirement Benefit Plans - Fair Value (Details) - Pension - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 10,004	$ 10,268	$ 10,483
Actual return on plan assets	1,099	(46)
Employer contributions	1,176	1,528
Settlements	(58)	(30)
Benefits paid	(1,120)	(1,425)
Foreign currency exchange rate change	(1,361)	(242)
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	86	129
International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,760	1,567
International bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,275	6,469
Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	580	611
Mutual Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,303	1,492
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	86	129
Level 1 | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	86	129
Level 1 | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | International bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,338	9,528
Level 2 | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,760	1,567
Level 2 | International bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,275	6,469
Level 2 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Mutual Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,303	1,492
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	580	611	$ 576
Actual return on plan assets	20	14
Employer contributions	198	189
Benefits paid	(211)	(202)
Foreign currency exchange rate change	(38)	34
Level 3 | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | International bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 580	$ 611