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		3 Months Ended		6 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Actuarial loss	[1]	$ 961	$ 667	$ 1,923	$ 1,336
Amortization of prior service cost	[1]	39	(254)	77	(509)
Other comprehensive income (loss)	[1]	1,000	413	2,000	827
Amounts reclassified from accumulated other comprehensive losses to net earnings		$ 1,000	$ 413	$ 2,000	$ 827

[1] Amounts are included in net periodic benefit costs for pension and postretirement plans. See Note 13 "Pension and Postretirement Benefits" to the "Notes to Condensed Consolidated Financial Statements" for further information.