Derivative Financial Instruments - Pretax Effect of Derivative Instruments on Earnings and OCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Net losses recognized in accumulated other comprehensive income (effective portion)	$ (5,915)	$ (2,260)	$ (2,583)	$ (5,385)
Net losses recognized in earnings (ineffective portion)	(119)	(143)	(170)	(650)
Derivative Instruments Designated as Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized in earnings (effective portion)	$ 5,132	$ (3,735)	$ 9,842	$ (5,954)

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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-Publisher FASB

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- Definition

The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

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- Definition

Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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