INVESTMENTS - PERCENTAGE OF SALES PAYMENTS (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018 USD ($) a	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($) a increment	Mar. 31, 2017 USD ($)
Investment Holdings [Line Items]
Revenues - sale of interest in leasehold land	$ 0	$ 0	$ 0	$ 1,678
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	0	$ 0	1,678
Fees - included in general and administrative expenses	0	0	0	(260)
Proceeds from sale of interest in leasehold land, net of fees paid	$ 0	$ 0	$ 0	$ 1,418
Land Interest
Investment Holdings [Line Items]
Area of land (in acres) | a	1,000		1,000