Variable Interest Entities - Additional Disclosures (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) VIE	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) VIE	Jun. 30, 2014 USD ($)	Sep. 30, 2014 VIE
Variable Interest Entity [Line Items]
Number of VIEs formed | VIE					3
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Variable Interest Entities, Income	$ 7.3	$ 3.8	$ 27.8	$ 8.0
Variable Interest Entities, Expense	$ 4.2	$ 1.6	$ 21.2	$ 3.1
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of VIEs | VIE	2		2
Grupo Finmart [Member] | VIE C and B [Member]
Variable Interest Entity [Line Items]
Percent of cash flows received			100.00%
Grupo Finmart [Member] | VIE A [Member]
Variable Interest Entity [Line Items]
Percent of cash flows received			50.00%