Fair Value Measurements Reconciliation of Change in Recurring Level 3 Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Securitized Beneficial Interests [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending Balance	$ 23,256
Fair Value, Measurements, Recurring [Member] | Securitized Beneficial Interests [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance, March 31, 2015	40,712	$ 35,559
Issuances of guarantees/sales of receivables	33,782	21,513
Settlements	(51,167)	(31,725)
Losses recognized in earnings	(71)	(464)
Ending Balance	23,256	24,883
Fair Value, Measurements, Recurring [Member] | Guarantees [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance, March 31, 2015	8,650	7,344
Issuances of guarantees/sales of receivables	4,557	4,281
Settlements	(5,484)	(4,363)
Losses recognized in earnings	0	0
Ending Balance	$ 7,723	$ 7,262