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Long-Term Obligations (Schedule Of Long-Term Obligations) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Debt Instrument [Line Items]    
Total outstanding $ 392,500 $ 408,750
Less current portion (211,250) (16,250)
Long-term obligations 181,250 392,500
Medium-Term Notes Due From 2012 To 2014 At Various Rates [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 300,000 310,000
Amortizing Bank Term Loan Maturing November 2016 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 92,500 $ 98,750