Pension And Other Postretirement Benefit Plans (Recognized In Accumulated Other Comprehensive Income (Loss) On Pretax Basis) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (benefit) arising during the year	$ (22,000)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain), beginning of year	93,357	108,171
Losses (gains) arising during the year	(12,834)	(928)
Reclassification adjustments during the year	(10,035)	(13,886)
Net actuarial loss (gain), end of year	70,488	93,357
Prior service cost (benefit), beginning of year	(2,617)	(3,080)
Prior service cost (benefit) arising during the year	(22,145)	0
Reclassification adjustments during the year	1,764	463
Prior service cost (benefit), end of year	(22,998)	(2,617)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes	47,490	90,740
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain), beginning of year	(3,918)	(4,644)
Losses (gains) arising during the year	(6,039)	717
Reclassification adjustments during the year	5	9
Net actuarial loss (gain), end of year	(9,952)	(3,918)
Prior service cost (benefit), beginning of year	226	500
Prior service cost (benefit) arising during the year	0	0
Reclassification adjustments during the year	(226)	(274)
Prior service cost (benefit), end of year	0	226
Total amounts in accumulated other comprehensive loss at end of year, before income taxes	$ (9,952)	$ (3,692)