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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	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
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	$ (151)	$ 0	$ 0

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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