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Financial Instruments - Location and fair value of derivative financial instruments reported in the consolidated balance sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 30, 2016
Cross-currency swap contracts | Other assets    
Derivatives, Fair Value [Line Items]    
Net investment hedges $ 15,135 $ 24,771
Costless collar contracts | Non-trade and notes receivable    
Derivatives, Fair Value [Line Items]    
Cash flow hedges 430 0
Costless collar contracts | Other accrued liabilities    
Derivatives, Fair Value [Line Items]    
Cash flow hedges $ 2,027 $ 8,368