Investments in Unconsolidated Entities and Marketable Securities - Unconsolidated Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]
Beazer’s investment in unconsolidated entities	$ 4,035	$ 3,994
Total equity of unconsolidated entities	10,113	11,811
Total outstanding borrowings of unconsolidated entities	12,266	15,797
Total equity in income of unconsolidated entities	375	371	$ 131
Impairment of unconsolidated entity investment	(341)	0	0
Income (Loss) from Equity Method Investments	$ 34	$ 371	$ 131