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Marketable Securities (Summary of available-for-sale securities ) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items]    
Marketable Securities, Noncurrent $ 7,673 $ 7,565
Foreign exchange contracts    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 7,149  
Gross Unrealized Gains 588  
Gross Unrealized Losses $ 64