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Organization, Basis of Presentation, and Summary of Significant Accounting Policies Repurchase Commitments (Details)	12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) unit	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) Members	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($) dealer	Jun. 30, 2016 USD ($) Members	Jun. 30, 2015 USD ($)
Accounting Policies [Abstract]
Repurchase Units, Number		3		0			3
Repurchase Dealers, Number						2	2
Impairment of Long-Lived Assets to be Disposed of			$ 0		$ 0			$ 0
Impairment of Intangible Assets (Excluding Goodwill)			0		0			$ 0
Floor Financing, Repurchase Obligations	$ 107,923,000	$ 107,923,000	$ 107,923,000	$ 107,923,000	$ 80,429,000	$ 80,429,000	$ 80,429,000
Repurchase Commitments, Period	2 years 6 months