Pension and Other Post-retirement Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Pension
Change in Benefit Obligation
Benefit obligation at beginning of the year	$ 39,096	$ 47,892
Service cost	1,308	1,583	1,310
Interest cost	1,734	1,903	2,111
Plan participants' contributions	0	73
Plan amendments	285	0
Actuarial (gain) loss	(377)	4,108
Foreign currency exchange rate change	2,009	(1,391)
Gross benefits paid	(1,302)	(1,300)
Curtailments and settlements	(38)	(13,772)
Benefit obligation at end of year	42,715	39,096	47,892
Change in Plan Assets
Fair value of plan assets at beginning of year	8,806	17,156
Actual return on plan assets	260	1,097
Foreign currency exchange rate changes	874	(799)
Employer contributions	1,346	2,490
Settlements	(38)	(9,911)
Plan participants' contributions	0	73
Gross benefits paid	(1,302)	(1,300)
Fair value of plan assets at end of year	9,946	8,806	17,156
Funded status at end of year
Fair value of plan assets	9,946	8,806	17,156
Benefit obligations	(42,715)	(39,096)	(47,892)
Amount recognized at end of year	(32,769)	(30,290)
Other Benefits
Change in Benefit Obligation
Benefit obligation at beginning of the year	799	1,057
Service cost	0	0	0
Interest cost	23	27	44
Plan participants' contributions	555	503
Plan amendments	0	0
Actuarial (gain) loss	94	(145)
Foreign currency exchange rate change	0	0
Gross benefits paid	(686)	(643)
Curtailments and settlements	0	0
Benefit obligation at end of year	785	799	1,057
Change in Plan Assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Foreign currency exchange rate changes	0	0
Employer contributions	131	140
Settlements	0	0
Plan participants' contributions	555	503
Gross benefits paid	(686)	(643)
Fair value of plan assets at end of year	0	0	0
Funded status at end of year
Fair value of plan assets	0	0	0
Benefit obligations	(785)	(799)	(1,057)
Amount recognized at end of year	$ (785)	$ (799)