Derivative Instruments - Fair Value of Derivative Instruments on the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Designated as Cash Flow Hedges | Short-term Investments | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 0	$ 66
Designated as Cash Flow Hedges | Long-term Derivative Assets | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	0	66
Designated as Cash Flow Hedges | Short-Term Derivative Liabilities | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	3,081	1,733
Designated as Cash Flow Hedges | Other Long Term Liabilities | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	386	446
Not Designated as Hedging Instrument | Short-term Investments
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	0	0
Not Designated as Hedging Instrument | Long-term Derivative Assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	0	0
Not Designated as Hedging Instrument | Short-Term Derivative Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	219	190
Not Designated as Hedging Instrument | Other Long Term Liabilities | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 0	$ 0