Pension Plans (Schedule of Net Pension Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Service costs	$ 390	$ 327	$ 1,131	$ 1,054
Interest costs	253	214	742	698
Amortization of actuarial loss	214	0	630	0
Settlements and curtailments	0	354	(36)	585
Net pension period cost	$ 857	$ 895	$ 2,467	$ 2,337