RELATED PARTY TRANSACTIONS (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) lot	Mar. 31, 2020 USD ($)
Kaupulehu Developments
Related party transactions
Revenues - sale of interest in leasehold land	$ 0	$ 0	$ 485	$ 0
Kaupulehu Developments | KD Kaupulehu, LLLP | Investment in land development partnerships | Increment I
Related party transactions
Revenues - sale of interest in leasehold land			$ 485
Number of single family lots sold | lot			2
KD Acquisition, LLLP | Investment in land development partnerships
Related party transactions
Ownership interest acquired	19.60%		19.60%
KD Acquisition II, LP | Barnwell Industries Inc | Investment in land development partnerships
Related party transactions
Ownership interest acquired	10.80%		10.80%