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Derivative Financial Instruments - Derivatives designated as hedging instruments (Details) - Designated As Hedging Instrument - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Foreign Exchange Contract    
Foreign currency exchange and interest rate swap contracts    
Other current assets $ 4,024 $ 3,264
Other long-term assets 216 147
Accrued expenses and other   318
Long-term liabilities 31 3
Interest rate swaps    
Foreign currency exchange and interest rate swap contracts    
Other long-term assets 439 1,349
Long-term liabilities $ 6,867 $ 3,633