Investment in Riverfront and Brooksville Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014
Total Investment	$ 18,665		$ 18,665		$ 18,537
Total Assets of the Partnership	49,930		49,930		48,187
Net Loss of the Partnership			(234)		(167)
Company's share of Net Loss of the Partnership	(150)	$ (31)	(180)	$ (63)	(128)
Cash	59		59		208
Cash held in escrow	13,896		13,896		18,822
Amortizable Debt costs	2,069		2,069		2,069
Investments in real estate, net	33,906		33,906		27,088
Total assets	49,930		49,930		48,187
Other liabilities	1,947		1,947		313
Long-term debt	17,000		17,000		17,000
Capital - FRP Holdings	18,665		18,665		18,537
Capital - Third parties	12,318		12,318		12,337
Total liabilities and capital	$ 49,930		$ 49,930		$ 48,187
Riverfront I Joint Venture
Ownership percent	76.91%		76.91%		76.91%
Total Investment	$ 11,146		$ 11,146		$ 11,031
Total Assets of the Partnership	35,588		35,588		33,834
Net Loss of the Partnership			(198)		(89)
Company's share of Net Loss of the Partnership	(140)		(162)		(89)
Total assets	35,588		35,588		33,834
Capital - FRP Holdings	$ 11,146		$ 11,146		$ 11,031
Brooksville Joint Venture
Ownership percent	50.00%		50.00%		50.00%
Total Investment	$ 7,519		$ 7,519		$ 7,506
Total Assets of the Partnership	14,342		14,342		14,353
Net Loss of the Partnership			(36)		(78)
Company's share of Net Loss of the Partnership			(18)		(39)
Total assets	14,342		14,342		14,353
Capital - FRP Holdings	$ 7,519		$ 7,519		$ 7,506