Other Comprehensive Income (Loss) Pretax Amounts by Component, Reclassified from Accumulated Other Comprehensive Loss to Earnings (Details) (Reclassification out of Accumulated Other Comprehensive Income [Member], Pensions, Net of Tax [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pensions, Net of Tax [Member]
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Actuarial loss	$ 884	$ (1,232)	$ 1,763	$ (1,232)
Amortization of prior service cost	(362)	711	(719)	711
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	522	(521)	1,044	(521)
Amounts reclassified from accumulated other comprehensive losses to net earnings	$ 522	$ (521)	$ 1,044	$ (521)