Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands	Sep. 30, 2011	Jun. 30, 2011
Fair value of derivatives
Total derivatives designated as hedging instruments	$ (19,607)	$ (2,469)
Derivatives not designated as hedging instruments	(50)	35
Total derivatives	(19,657)	(2,434)
Range Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Fair value of derivatives
Derivative assets designated as hedging instruments	982	87
Range Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Fair value of derivatives
Derivative liabilities designated as hedging instruments	(11)	(159)
Currency Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Fair value of derivatives
Derivative assets designated as hedging instruments	82	37
Currency Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Fair value of derivatives
Derivative liabilities designated as hedging instruments	(132)	(2)
Forward Starting Interest Rate Swap Contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Fair value of derivatives
Derivative assets designated as hedging instruments	0	772
Forward Starting Interest Rate Swap Contracts [Member] | Designated as Hedging Instrument [Member] | Other liabilities [Member]
Fair value of derivatives
Derivative liabilities designated as hedging instruments	$ (20,578)	$ (3,169)