Finance Receivables Delinquency (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 31 to 60 Days Past Due	$ 561,437	$ 441,069
Financing Receivable, Recorded Investment, Greater than 60 Days Past Due	204,029	164,357
Financing Receivable, Recorded Investment, Greater than 30 Days Past Due	765,466	605,426
Financing Receivable in Repossesion	37,467	34,230
Financing Receivable, Recorded Investment, Past Due	$ 802,933	$ 639,656
Percent of Contractual Amount Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Percent of Contractual Amount Due 31 Days to 60 days	5.20%	4.70%
Percent of Contractual Amount Due Greater Than 60 Days	1.90%	1.70%
Percent of Contractual Amount Due Greater than 31 days	7.10%	6.40%
Percent of Contractual Amount Due in Repossession	0.30%	0.40%
Percent of Contracutal Amount Due Greater Than 31 Days and in Repossession	7.40%	6.80%