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Restructuring And Impairments (Schedule Of Restructuring Charges And Cash Payments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Restructuring and Related Cost [Line Items]    
Accrued restructuring beginning balance $ 2,203   
Charges to operations 2,181 5,564
Cash payments (1,663) (2,843)
Accrued restructuring ending balance 2,721 2,721
Severance Pay And Benefits [Member]
    
Restructuring and Related Cost [Line Items]    
Accrued restructuring beginning balance 2,076   
Charges to operations 2,181 5,437
Cash payments (1,647) (2,827)
Accrued restructuring ending balance 2,610 2,610
Facility Exit Costs [Member]
    
Restructuring and Related Cost [Line Items]    
Accrued restructuring beginning balance 127   
Charges to operations   127
Cash payments (16) (16)
Accrued restructuring ending balance $ 111 $ 111