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Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Goodwill [Roll Forward]    
Beginning of the period $ 400,917 $ 343,684
Acquisitions 28,667 57,206
Currency exchange rate impact 20 27
End of the period $ 429,604 $ 400,917