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Retirement Benefit Plans (Details) (Postretirement Medical Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Postretirement Medical Plan [Member]
Schedule of reconciliation of the benefit obligation for the postretirement medical plan
Benefit obligation at beginning of year	$ 871	$ 877
Interest cost	36	38
Actuarial (gain) loss	(30)	24
Benefits paid	(73)	(68)
Benefit obligation at end of year	$ 804	$ 871

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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