Derivative Financial Instruments - Fair Value of Derivative Instruments on the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014
Designated as Cash Flow Hedges | Short-term Investments | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 128	$ 5,474
Designated as Cash Flow Hedges | Long-term Derivative Assets | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	136	862
Designated as Cash Flow Hedges | Short-Term Derivative Liabilities | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	4,128	252
Designated as Cash Flow Hedges | Other Long Term Liabilities | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	163	0
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	0
Not Designated as Hedging Instrument | Short-term Investments
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	25	0
Not Designated as Hedging Instrument | Long-term Derivative Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2	0
Not Designated as Hedging Instrument | Short-Term Derivative Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 2	$ 69