Investments in Unconsolidated Entities and Marketable Securities - Unconsolidated Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Beazer’s investment in unconsolidated entities	$ 3,994	$ 10,470
Total equity of unconsolidated entities	11,811	31,615
Total outstanding borrowings of unconsolidated entities	15,797	14,702
Income from unconsolidated entity activity	$ 371	$ 131	$ 536