Pension And Other Postretirement Benefit Plans (Components Of Company's Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,115	$ 1,229	$ 3,507	$ 3,499
Interest cost	2,883	3,174	8,605	9,493
Expected return on plan assets	(3,517)	(3,544)	(10,602)	(10,238)
Settlement costs	0	1,975	0	3,304
Net amortization and deferral	1,022	2,522	5,916	7,886
Net periodic benefit cost	1,503	5,356	7,426	13,944
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	137	151	406	445
Interest cost	521	582	1,561	1,727
Expected return on plan assets	(29)	(31)	(89)	(93)
Settlement costs	0	0	0	0
Net amortization and deferral	(16)	56	(50)	156
Net periodic benefit cost	$ 613	$ 758	$ 1,828	$ 2,235