Derivative Instruments and Hedging Activities (Details) (USD $)	12 Months Ended
	Sep. 30, 2013 Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member]	Sep. 30, 2012 Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member]	Sep. 30, 2013 Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member] Interest expense/Other income [Member]	Sep. 30, 2012 Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member] Interest expense/Other income [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member] Interest expense/Other income [Member]	Sep. 30, 2013 Non-designated derivatives [Member] Gold Collar [Member] Other income [Member]	Sep. 30, 2012 Non-designated derivatives [Member] Gold Collar [Member] Other income [Member]	Sep. 30, 2011 Non-designated derivatives [Member] Gold Collar [Member] Other income [Member]	Sep. 30, 2013 Other Assets [Member] Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member]	Sep. 30, 2012 Other Assets [Member] Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member]	Sep. 30, 2013 Cross-border Debt [Member] Grupo Finmart [Member]	May 15, 2013 Cross-border Debt [Member] Grupo Finmart [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cross-border debt offering												$ 30,000,000	$ 30,000,000
Fair value of derivative instrument										1,813,000	0
Amount of (gain) recognized in Income							0	(151,000)	0
Amount of loss recognized in Other Comprehensive Income on derivatives (effective portion)	148,000	0	0
Amount of (gain) loss on derivatives reclassified into Income from Accumulated Other Comprehensive Income (effective portion)				$ (1,974,000)	$ 0	$ 0