Pension And Other Postretirement Benefit Plans (Benefit Obligations, Plan Assets, And Funded Status) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Settlements, plan assets		$ (7,000)
Plan assets at fair value, end of year	224,553	213,282
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	287,133	258,240
Projected benefit obligation	288,908	259,928
Projected benefit obligation, beginning of year	259,928		299,161
Service cost	5,099	5,190	4,650
Effect of discount rate change	30,744	(8,316)
Plan amendment	0	(22,145)
Foreign currency exchange rate changes	(6,033)	22
Curtailments	0	0
Settlements, benefit obligation	0	(2,136)
Other	2,879	(2,586)
Benefit payments	(14,924)	(21,485)
Projected benefit obligation, end of year	288,908	259,928
Plan assets at fair value, beginning of year	213,282	205,942
Actual return on plan assets	23,486	15,758
Employer contributions	8,063	17,866
Foreign currency exchange rate changes	(5,354)	(2,663)
Settlements, plan assets	0	(2,136)
Plan assets at fair value, end of year	224,553	213,282	205,942
Funded status of the plans, end of year	(64,355)	(46,646)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	40,863	41,846
Projected benefit obligation, beginning of year	41,846		48,970
Service cost	347	527	467
Effect of discount rate change	2,669	(2,483)
Plan amendment	0	0
Foreign currency exchange rate changes	(444)	0
Curtailments	(1,465)	0
Settlements, benefit obligation	0	0
Other	(788)	(4,282)
Benefit payments	(3,001)	(2,992)
Projected benefit obligation, end of year	40,863	41,846
Plan assets at fair value, beginning of year	2,535	2,932
Actual return on plan assets	73	97
Employer contributions	2,508	2,498
Foreign currency exchange rate changes	0	0
Settlements, plan assets	0	0
Plan assets at fair value, end of year	2,115	2,535	2,932
Funded status of the plans, end of year	$ (38,748)	$ (39,311)