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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, 2012
Mar. 31, 2011
Mar. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value, end of year $ 199,525 $ 195,715  
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 278,128 236,701  
Projected benefit obligation 302,632 262,085 243,760
Projected benefit obligation, beginning of year 262,085 243,760  
Service cost 4,614 4,835 3,815
Interest cost 13,959 14,168 14,899
Effect of discount rate change 34,292 15,174  
Foreign currency exchange rate changes (1,733) 1,626  
Curtailment 0 966  
Settlements 0 (8,483)  
Other 5,975 5,411  
Benefit payments (16,560) (15,372)  
Projected benefit obligation, end of year 302,632 262,085 243,760
Plan assets at fair value, beginning of year 195,715 182,792  
Actual return on plan assets 15,451 26,077  
Employer contributions 6,259 9,211  
Foreign currency exchange rate changes (1,340) 1,490  
Plan assets at fair value, end of year 199,525 195,715 182,792
Funded status of the plans, end of year (103,107) (66,370)  
Other Postretirement Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 0 0  
Projected benefit obligation 48,784 43,888 43,429
Projected benefit obligation, beginning of year 43,888 43,429  
Service cost 591 787 581
Interest cost 2,636 2,534 2,789
Effect of discount rate change 5,205 2,245  
Foreign currency exchange rate changes 0 0  
Curtailment 0 0  
Settlements 0 0  
Other 529 (1,222)  
Benefit payments (4,065) (3,885)  
Projected benefit obligation, end of year 48,784 43,888 43,429
Plan assets at fair value, beginning of year 3,284 3,499  
Actual return on plan assets 146 238  
Employer contributions 3,697 3,432  
Foreign currency exchange rate changes 0 0  
Plan assets at fair value, end of year 3,062 3,284 3,499
Funded status of the plans, end of year $ (45,722) $ (40,604)