INVESTMENTS - PERCENTAGE OF SALES PAYMENTS (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017 USD ($) a	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) a increment	Jun. 30, 2016 USD ($)
Investment Holdings [Line Items]
Revenues - sale of interest in leasehold land	$ 0	$ 1,775	$ 1,678	$ 2,255
Kaupulehu Developments
Investment Holdings [Line Items]
Area of land (in acres) | a	870		870
Number of development increments | increment			2
Revenues - sale of interest in leasehold land	$ 0	1,775	$ 1,678	2,255
Fees - included in general and administrative expenses	0	(273)	(260)	(340)
Proceeds from sale of interest in leasehold land, net of fees paid	$ 0	$ 1,502	$ 1,418	$ 1,915
Land Interest
Investment Holdings [Line Items]
Area of land (in acres) | a	1,000		1,000