Other Comprehensive Income (Loss) Pretax Amounts by Component, Reclassified from Accumulated Other Comprehensive Loss to Earnings (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Settlement loss		$ (1,120)	$ 0	$ (1,120)	$ 0
Reclassification out of Accumulated Other Comprehensive Income | Pensions, Net of Tax
Reclassification Out Of Accumulated Other Comprehensive Income [Line Items]
Actuarial loss	[1]	628	948	1,883	2,871
Amortization of prior service cost	[1]	(167)	(223)	(501)	(146)
Curtailment		0	1,062	0	1,062
Settlement loss		1,120	0	1,120	0
Amounts reclassified from accumulated other comprehensive losses to net earnings	[1]	$ 1,581	$ 1,787	$ 2,502	$ 3,787

[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.