Fair Value Measurements Textuals (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016
Securitized Beneficial Interests
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other income	$ 639	$ 568	$ 1,521
Securitized Beneficial Interests
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 10 percent adverse change in other assumption	61
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 20 percent adverse change in other assumption	123
Guarantees
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 10 percent adverse change in other assumption	661
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 20 percent adverse change in other assumption	$ 1,302