Derivative Financial Instruments - Fair Value of Derivative Instruments on the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Jun. 30, 2015
Short-term derivative assets: [Member] | Derivative Instruments Designated as Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 31	$ 128
Short-term derivative assets: [Member] | Derivative Instruments Not Designated as Accounting Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		5	25
Long-term derivative assets: [Member] | Derivative Instruments Designated as Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	69	136
Long-term derivative assets: [Member] | Derivative Instruments Not Designated as Accounting Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	0	2
Short-term derivative liabilities: [Member] | Derivative Instruments Designated as Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		3,496	4,128
Short-term derivative liabilities: [Member] | Derivative Instruments Not Designated as Accounting Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		241	2
Long-term derivative liabilities: [Member] | Derivative Instruments Designated as Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[2]	641	163
Long-term derivative liabilities: [Member] | Derivative Instruments Not Designated as Accounting Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[2]	$ 0	$ 0

[1] Included in "Short-term derivative liabilities" on the Company's consolidated balance sheets.

[2] Included in "Other long-term liabilities" on the Company's consolidated balance sheets.