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Restructuring And Impairment Costs (Reconciliation Of Company's Liability For The Restructuring Costs) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Restructuring Cost and Reserve [Line Items]    
Costs charged to expense $ 11,661 $ 11,791
Payments (16,710) (5,180)
Balance 1,562 6,611
Employee Termination Benefits [Member]
    
Restructuring Cost and Reserve [Line Items]    
Costs charged to expense 8,564 11,155
Payments (13,679) (4,769)
Balance (1,271) 6,386
Other Costs [Member]
    
Restructuring Cost and Reserve [Line Items]    
Costs charged to expense 3,097 636
Payments (3,031) (411)
Balance $ 291 $ 225