Pension and Other Post-retirement Benefit Plans (Details 4) (Pension, USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 9,946	$ 8,806	$ 17,156
Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,946	8,806
Fair Value | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,512	2,884
Fair Value | International bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,636	5,098
Fair Value | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	706	636
Fair Value | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	92	188
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,240	8,170
Level 1 | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,512	2,884
Level 1 | International bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,636	5,098
Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	92	188
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	706	636
Level 3 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 706	$ 636