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Interest on Borrowings (Narratives) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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