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Long-Term Obligations (Schedule Of Long-Term Obligations) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Debt Instrument [Line Items]    
Total outstanding $ 356,250 $ 392,500
Less current portion (116,250) (211,250)
Long-term obligations 240,000 181,250
Medium-Term Notes Due From 2012 To 2014 At Various Rates [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 100,000 300,000
Senior term note due 2018 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Gross 175,000 0
Amortizing Bank Term Loan Maturing November 2016 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 81,250 $ 92,500