Variable Interest Entities - Additional Disclosures (Details) $ in Millions	12 Months Ended
	Sep. 30, 2014 USD ($) VIE
Variable Interest Entity [Line Items]
Number of variable interest entities formed | VIE	3
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Income earned by VIEs	$ 16.2
VIE expenses	$ 7.4
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of VIEs | VIE	2
Grupo Finmart [Member] | VIE B and C [Member]
Variable Interest Entity [Line Items]
Percent of cash flows received from VIE	100.00%
Grupo Finmart [Member] | VIE A [Member]
Variable Interest Entity [Line Items]
Percent of cash flows received from VIE	50.00%