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Derivatives (Narratives) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Total notional amount of Company's variable interest rate swaps $ 236,800    
Notional amount of operating lease 7,800    
Change in fair value of cash flow hedges, net of tax 6,149 $ 6,027 $ 5,086
Loss reclassified from AOCI into income (effective portion) 8,628 $ 12,616 $ 14,358
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months $ 4,600