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SUBSEQUENT EVENTS	6 Months Ended
SUBSEQUENT EVENTS	Mar. 31, 2018
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS In April 2018, Kaupulehu Developments received a percentage of sales payment of $310,000 from the sale of a lot within Phase II of Increment I. Financial results from the receipt of this payment will be reflected in Barnwell’s quarter ending June 30, 2018. In April 2018, the Kukio Resort land development partnerships made a cash distribution to its partners of which Barnwell received $373,000, after distributing $48,000 to minority interests. The receipt of this distribution, which does not impact net earnings or loss, will be reflected in Barnwell's quarter ending June 30, 2018. In May 2018, the Kilauea volcano on the island of Hawaii erupted in the district of Puna on the eastern part of the island. Barnwell owns approximately sixteen acres of land near the sites of the eruptions with a carrying value of $165,000. Any impact to the carrying value of the land will be reflected in Barnwell’s quarter ending June 30, 2018.