Fair Value Measurements Reconciliation of Change in Recurring Level 3 Balances (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Sep. 30, 2013 Securitized Beneficial Interests [Member]	Sep. 30, 2012 Securitized Beneficial Interests [Member]	Mar. 31, 2013 Securitized Beneficial Interests [Member]	Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Securitized Beneficial Interests [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Securitized Beneficial Interests [Member]	Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Securitized Beneficial Interests [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Securitized Beneficial Interests [Member]	Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Guarantees [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Guarantees [Member]	Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Guarantees [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Guarantees [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance				$ 21,349	$ 35,368	$ 31,992	$ 25,864	$ 6,176	$ 5,803	$ 6,367	$ 5,265
Issuance of guarantees/sales of receivables				69,857	55,541	111,998	111,879	2,171	5,170	6,038	9,062
Settlements				(54,405)	(67,888)	(107,222)	(114,168)	(2,324)	(1,484)	(6,382)	(4,838)
Losses recognized in earnings				(1,497)	(2,032)	(1,464)	(2,586)	0	0	0	0
Ending Balance	35,304			35,304	20,989	35,304	20,989	6,023	9,489	6,023	9,489
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other income	$ 1,275	$ 1,052	$ 1,538