Derivative Instruments (Company's Outstanding Commodity Derivatives) (Details)	3 Months Ended
	Dec. 31, 2012 oz	Sep. 30, 2012 oz
Platinum [Member]
Derivative [Line Items]
Ounces	2,051	20,981
Average Price	1,447	1,498
Palladium [Member]
Derivative [Line Items]
Ounces	1,800	30,681
Average Price	614	631
Rhodium [Member]
Derivative [Line Items]
Ounces	1,905	4,803
Average Price	1,232	1,359