Derivatives (Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Total notional amount of Company's variable interest rate swaps	$ 282,100
Notional amount of operating lease	9,300
Change in fair value of cash flow hedges, net of tax	6,027	$ 5,086	$ 11,977
Loss reclassified from AOCI into income (effective portion)	12,616	$ 14,358	$ 16,691
Reclassify net losses on interest rate contracts from AOCI to earnings over the next twelve months	$ 9,000