Variable Interest Entities - Maximum Exposure of LOC Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash collateral and other assets	$ 723	$ 9,135
Expected LOC losses	880	4,708
Accounts payable	40	1,026
Maximum exposure for LOC losses	$ 1,294	29,502
Exposure secured by titles to customers' automobiles		$ 7,800