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Restructuring Costs (Reconciliation Of Company's Liability For The Restructuring Costs) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]    
Balance at beginning of year $ 1,562 $ 6,611
Costs charged to expense 3,687 9,821
Payments (5,019) (10,951)
Balance at end of period 230 5,481
Employee Termination Benefits [Member]
    
Restructuring Cost and Reserve [Line Items]    
Balance at beginning of year 1,271 6,386
Costs charged to expense 3,687 6,724
Payments (4,766) (10,914)
Balance at end of period 192 2,196
Other Costs [Member]
    
Restructuring Cost and Reserve [Line Items]    
Balance at beginning of year 291 225
Costs charged to expense 0 3,097
Payments (253) (37)
Balance at end of period $ 38 $ 3,285