Pension And Other Postretirement Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Revised healthcare cost trend assumption	7.20%
Ultimate healthcare cost trend rate	4.50%
Year that rate reaches healthcare cost trend rate	2028
Lump sum distribution payments to terminated employees		$ 7,000,000
Prior service credit		(22,000,000)
Effect of one-percentage-point decrease on accumulated postretirement benefit obligation	1,200,000
Effect of one-percentage-point increase on accumulated postretirement benefit obligation	1,300,000
Net actuarial loss expected in net periodic benefit cost during fiscal year 2014	8,400,000
Prior service benefit expected in net periodic benefit cost during fiscal year 2014	3,400,000
Percentage of total plan assets	91.00%
Percentage of total projected benefit obligation	80.00%
Expected company contributions in 2014	12,000,000
Pension and Other Postretirement Benefit Expense	1,800,000	1,600,000	1,500,000
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments	0	0
Lump sum distribution payments to terminated employees	0	2,136,000
Prior service credit	675,000	22,145,000
Funded status of the plans, end of year	64,355,000	46,646,000
Percentage of funded status of plans	60.00%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments	1,465,000	0
Revised healthcare cost trend assumption	7.20%	7.40%	7.60%
Lump sum distribution payments to terminated employees	0	0
Prior service credit	0	0
Funded status of the plans, end of year	38,748,000	39,311,000
Percentage of funded status of plans	95.00%
ERISA-regulated U.S. plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected company contributions in 2014	5,400,000
Non-ERISA regulated and Other Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected company contributions in 2014	$ 6,600,000