Interest on Borrowings (Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]
Interest paid in cash including payments related to derivative contracts	$ 113,700	$ 95,100	$ 95,000
Fees on early extinguishment of debt			$ 3,783