Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012
Fair value of derivatives
Total derivatives designated as hedging instruments	$ (648)	$ 364
Total derivatives not designated as hedging instruments	38	1,298
Total derivatives	(610)	1,662
Range Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Fair value of derivatives
Derivative assets designated as hedging instruments	114	554
Range Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Fair value of derivatives
Derivative liabilities designated as hedging instruments	(762)	(193)
Range Forward Contracts [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Fair value of derivatives
Derivative assets designated as hedging instruments	0	3
Currency Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Fair value of derivatives
Derivative assets designated as hedging instruments	98	1,298
Currency Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Fair value of derivatives
Derivative liabilities designated as hedging instruments	$ (60)	$ 0