Derivative Financial Instruments - Fair Value of Derivative Instruments on the Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013
Designated as Cash Flow Hedges | Short-term Investments [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 5,474		$ 0
Designated as Cash Flow Hedges | Long-term Derivative Assets [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	862	[1]	0	[1]
Designated as Cash Flow Hedges | Short-Term Derivative Liabilities [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	252		9,331
Designated as Cash Flow Hedges | Other Accrued Liabilities [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0		0
Designated as Cash Flow Hedges | Other Long Term Liabilities [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0		1,129
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0		0
Not Designated as Hedging Instrument [Member] | Short-term Investments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0		4
Not Designated as Hedging Instrument [Member] | Long-term Derivative Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	[1]	0	[1]
Not Designated as Hedging Instrument [Member] | Short-Term Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	69		565
Not Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 0		$ 25

[1] Included in "Other assets" on the consolidated balance sheets.