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Interest Rate Swap Agreements - Summary of activity in company's notional amounts of interest rate swap agreements (Details) (Interest Rate Swap, USD $)
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Jul. 30, 2012
Jun. 04, 2012
Interest Rate Swap
        
Derivatives Fair Value [Roll Forward]        
Notional amounts at beginning of year $ 50,000,000    $ 25,000,000 $ 25,000,000
New contracts    50,000,000    
Matured contracts          
Notional amounts at end of year $ 50,000,000 $ 50,000,000 $ 25,000,000 $ 25,000,000