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Foreign Exchange Forward Contracts (Narratives) (Details)
3 Months Ended 9 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
Contract
Derivative [Line Items]          
Foreign currency transactions realized gain (loss)   $ (300,000) $ 100,000 $ (1,500,000)  
Maximum          
Derivative [Line Items]          
Foreign currency transactions realized gain (loss) $ (100,000)        
Not Designated as Hedging Instrument | Forward Foreign Currency Contracts          
Derivative [Line Items]          
Number of derivative financial instruments | Contract         0
Notional principal amount of forward foreign currency contracts $ 6,700,000   $ 6,700,000    
Maximum maturities for contracts     90 days