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Interest Rate Swap Agreements - Summary of variable rates received and fixed rates paid under swap (Details 3) (Interest Rate Swap)
 3 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Interest Rate Swap
        
Derivative [Line Items]        
Variable rate received 0.17% 0.21% 0.18% 0.24%
Fixed rate paid 0.94% 0.94% 0.94% 0.95%