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, 2013	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value, end of year	$ 205,942	$ 199,525
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	280,626	278,128
Projected benefit obligation	299,161	302,632	262,085
Projected benefit obligation, beginning of year	302,632	262,085
Service cost	4,650	4,614	4,835
Interest cost	13,001	13,959	14,168
Effect of discount rate change	13,798	34,292
Foreign currency exchange rate changes	(1,528)	(1,733)
Settlements	(13,027)	0
Other	(6,420)	5,975
Benefit payments	(13,945)	(16,560)
Projected benefit obligation, end of year	299,161	302,632	262,085
Plan assets at fair value, beginning of year	199,525	195,715
Actual return on plan assets	22,865	15,451
Employer contributions	11,552	6,259
Foreign currency exchange rate changes	(1,028)	(1,340)
Plan assets at fair value, end of year	205,942	199,525	195,715
Funded status of the plans, end of year	(93,219)	(103,107)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	0	0
Projected benefit obligation	48,970	48,784	43,888
Projected benefit obligation, beginning of year	48,784	43,888
Service cost	467	591	787
Interest cost	2,303	2,636	2,534
Effect of discount rate change	3,068	5,205
Foreign currency exchange rate changes	0	0
Settlements	0	0
Other	(2,733)	529
Benefit payments	(2,919)	(4,065)
Projected benefit obligation, end of year	48,970	48,784	43,888
Plan assets at fair value, beginning of year	3,062	3,284
Actual return on plan assets	151	146
Employer contributions	2,638	3,697
Foreign currency exchange rate changes	0	0
Plan assets at fair value, end of year	2,932	3,062	3,284
Funded status of the plans, end of year	$ (46,038)	$ (45,722)