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Derivative Instruments and Hedging Activities (Details) (Non-designated derivatives [Member], Gold collar [Member], Other Income (Expense) [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Non-designated derivatives [Member] | Gold collar [Member] | Other Income (Expense) [Member]
       
Fair value of the Company's derivative financial instruments on the consolidated statement of operations        
(Gains) Losses Recognized in Income $ 0 $ 0 $ (151) $ 0