Investments in Unconsolidated Entities and Marketable Securities - Unconsolidated Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]
Beazer’s investment in unconsolidated entities	$ 10,470	$ 13,734
Total equity of unconsolidated entities	31,615	52,118
Total outstanding borrowings of unconsolidated entities	14,702	12,206
Income from unconsolidated entity activity	$ 131	$ 536	$ 6,545