Variable Interest Entities - Maximum Exposure of LOC Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash collateral and other assets	$ 6,614	$ 9,135	$ 11,363
Expected LOC losses	3,180	4,708	3,069
Accounts payable	718	1,026	2,180
Maximum exposure for LOC losses	20,514	29,502	29,430
Exposure secured by titles to customers' automobiles	$ 5,600	$ 7,800	$ 7,500