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Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Goodwill [Roll Forward]    
Beginning of the period $ 218,224 $ 218,213
Acquisitions 31,553 0
Currency exchange rate impact and other (36) 11
End of the period $ 249,741 $ 218,224