COMMITMENTS AND CONTINGENCIES - Contractual Commitments - Land Pipeline (Details)						3 Months Ended					9 Months Ended
	Oct. 30, 2017 USD ($) a entity $ / a	Apr. 25, 2017 USD ($) a $ / a	Apr. 13, 2017 USD ($) a $ / a	Apr. 05, 2017 USD ($) a $ / a	Mar. 22, 2017 USD ($) a $ / a	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) a $ / a	Mar. 31, 2017 USD ($) a $ / a	Sep. 30, 2016 a	Mar. 31, 2016 a	Sep. 30, 2017 USD ($) a $ / a	Sep. 30, 2016 a
Contracts
No. of Acres | a							81.43	1,587.35	4.5	7.5	1,668.78	12.0
Contract Amount | $						$ 0	$ 10,858,000	$ 28,707,000			$ 39,565,000
Price per Acre | $ / a							133,000	18,000			24,000
Commercial
Contracts
No. of Acres | a		30.00	4.50	27.50	6.35
Contract Amount | $		$ 2,938,000	$ 1,235,000	$ 3,218,000	$ 1,556,000
Price per Acre | $ / a		98,000	274,000	117,000	245,000
Expected
Contracts
Number of purchase and sale agreements | entity	12
Number of buyers | entity	11
No. of Acres | a	5,834
Area of land sales as a percentage of land holdings	72.00%
Contract Amount | $	$ 146,114,000
Price per Acre | $ / a	25,000
Expected | Mitigation Bank joint venture
Contracts
Ownership interest retained (as a percent)	30.00%
Expected | Institutional investor | Mitigation Bank joint venture
Contracts
Interest acquired in joint venture (as a percent)	70.00%
Expected | Buyer's option
Contracts
No. of Acres | a	71
Contract Amount | $	$ 574,000
Expected | Base contract
Contracts
No. of Acres | a	129
Contract Amount | $	$ 2,750,000
Expected | Commercial/Retail | Property East of I-95, one
Contracts
No. of Acres | a	123
Contract Amount | $	$ 29,250,000
Price per Acre | $ / a	238,000
Expected | Commercial/Retail | Property East of I-95, one | Minimum
Contracts
Cost of requisite mitigation credits as a percentage of land sale contract amount	5.00%
Expected | Commercial/Retail | Property East of I-95, one | Maximum
Contracts
Cost of requisite mitigation credits as a percentage of land sale contract amount	10.00%
Expected | Commercial/Retail | Buc'ees - East of I-95
Contracts
No. of Acres | a	35
Contract Amount | $	$ 14,000,000
Price per Acre | $ / a	400,000
Expected | Commercial/Retail | Buc'ees - East of I-95 | Minimum
Contracts
Cost of requisite mitigation credits as a percentage of land sale contract amount	5.00%
Expected | Commercial/Retail | Buc'ees - East of I-95 | Maximum
Contracts
Cost of requisite mitigation credits as a percentage of land sale contract amount	10.00%
Expected | Commercial/Retail | Property East of I-95, two
Contracts
No. of Acres | a	21
Contract Amount | $	$ 5,777,000
Price per Acre | $ / a	275,000
Expected | Commercial/Retail | Specialty Grocer - East of I-95
Contracts
No. of Acres | a	9
Contract Amount | $	$ 2,700,000
Price per Acre | $ / a	300,000
Expected | Residential (AR) | Minto II - West of I-95
Contracts
No. of Acres | a	1,614
Contract Amount | $	$ 26,500,000
Price per Acre | $ / a	16,000
Expected | Residential (SF) | ICI Homes II - West of I-95
Contracts
No. of Acres | a	1,016
Contract Amount | $	$ 21,000,000
Price per Acre | $ / a	21,000
Expected | Residential (SF) | Property west of Interstate 95
Contracts
No. of Acres | a	200
Contract Amount | $	$ 3,324,000
Price per Acre | $ / a	17,000
Expected | Residential (SF) | ICI Homes - West of I-95
Contracts
No. of Acres | a	146
Contract Amount | $	$ 1,400,000
Price per Acre | $ / a	10,000
Expected | Residential (Multi-Family) | Property east of Interstate 95
Contracts
No. of Acres | a	45
Contract Amount | $	$ 5,200,000
Price per Acre | $ / a	116,000
Expected | Residential (Multi-Family) | Buyer's option | Property east of Interstate 95
Contracts
No. of Acres | a	19
Contract Amount | $	$ 2,000,000
Expected | Residential (Multi-Family) | Base contract | Property east of Interstate 95
Contracts
No. of Acres | a	26
Contract Amount | $	$ 3,200,000
Expected | Retail site | Mixed-Use Retail - North American - East of I-95
Contracts
No. of Acres | a	62
Contract Amount | $	$ 16,963,000
Price per Acre | $ / a	273,000
Expected | Commercial | Mitigation Bank - Term Sheet - West of I-95
Contracts
No. of Acres | a	2,492
Contract Amount | $	$ 15,000,000
Price per Acre | $ / a	6,000
Expected | Distribution/Warehouse | Property east of Interstate 95
Contracts
No. of Acres | a	71
Contract Amount | $	$ 5,000,000
Price per Acre | $ / a	70,000