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Long-Term Obligations (Narrative) (Details) (USD $)
12 Months Ended
Mar. 31, 2012
Nov. 30, 2011
Mar. 31, 2011
Debt Instrument [Line Items]      
Loans Payable to Bank   $ 100,000,000  
Term loan, consecutive quarterly installments 19 consecutive quarterly installments    
Long-term obligations 428,000,000   416,000,000
Long-term debt 392,500,000   320,193,000
Long-term debt maturities, 2013 16,000,000    
Long-term debt maturities, 2014 211,000,000    
Long-term debt maturities, 2015 116,000,000    
Long-term debt maturities, 2016 28,000,000    
Long-term debt maturities, 2017 38,000,000    
Minimum [Member]
     
Debt Instrument [Line Items]      
Medium-term notes maturity date September 1, 2012    
Medium-term notes interest rate, percentage 5.20%    
Maximum [Member]
     
Debt Instrument [Line Items]      
Medium-term notes maturity date December 1, 2014    
Medium-term notes interest rate, percentage 6.25%    
Interest Rate Swap Agreements [Member]
     
Debt Instrument [Line Items]      
Long-term debt 245,000,000    
Derivative asset value 1,100,000   10,200,000
Notional amount of interest rate fair value hedge derivatives   $ 99,000,000  
Long-term Debt [Member]
     
Debt Instrument [Line Items]      
Interest rate, term loan 3.16%