Pension and Other Post-retirement Benefit Plans (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Target allocation and weighted-average asset allocations
Target Allocation (as a percent)	100.00%
Plan Assets (as a percent)	100.00%
Estimated future pension benefit payments
2015	$ 1,565
2016	1,662
2017	1,763
2018	1,694
2019	2,034
2020 - 2024	11,062
Pension
Other changes in plan assets and benefit obligations recognized in Accumulated other comprehensive income
Current year actuarial (gain) loss	(190)	3,669	2,845
Foreign currency exchange rate changes	0	(238)	(218)
Amortization of actuarial gain (loss)	(286)	(4,582)	(392)
Current year prior service cost	285	0	0
Amortization of prior service cost	(4)	(101)	(25)
Total recognized in other comprehensive income	(195)	(1,252)	2,210
Total recognized in net periodic benefit cost and other comprehensive income (loss)	2,683	2,408	5,336
Estimated future pension benefit payments
2015	1,476
2016	1,575
2017	1,680
2018	1,615
2019	1,959
2020 - 2024	10,765
Other Benefits
Other changes in plan assets and benefit obligations recognized in Accumulated other comprehensive income
Current year actuarial (gain) loss	95	(145)	(206)
Foreign currency exchange rate changes	259	322	323
Amortization of actuarial gain (loss)	0	0	0
Current year prior service cost	0	0	0
Amortization of prior service cost	0	0	0
Total recognized in other comprehensive income	354	177	117
Total recognized in net periodic benefit cost and other comprehensive income (loss)	118	(118)	(162)
Estimated future pension benefit payments
2015	89
2016	87
2017	83
2018	79
2019	75
2020 - 2024	$ 297
Insurance
Target allocation and weighted-average asset allocations
Target Allocation (as a percent)	10.00%
Plan Assets (as a percent)	7.00%
International equities
Target allocation and weighted-average asset allocations
Target Allocation (as a percent)	30.00%
Plan Assets (as a percent)	35.00%
International bonds
Target allocation and weighted-average asset allocations
Target Allocation (as a percent)	50.00%
Plan Assets (as a percent)	57.00%
Other
Target allocation and weighted-average asset allocations
Target Allocation (as a percent)	10.00%
Plan Assets (as a percent)	1.00%