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Long-Term Obligations (Schedule Of Long-Term Obligations) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Mar. 31, 2011
Debt Instrument [Line Items]    
Total outstanding $ 408,750 $ 415,193
Less current portion (16,250) (95,000)
Long-term obligations 392,500 320,193
Medium-Term Notes Due From 2012 To 2014 At Various Rates [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 310,000 415,193
Amortizing Bank Term Loan Maturing November 2016 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 98,750 $ 0