Investments in Marketable Securities and Unconsolidated Entities - Narrative (Details) (USD $)	12 Months Ended				12 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Jul. 01, 2014	Sep. 30, 2014 The REIT	May 03, 2012 The REIT home	Sep. 30, 2014 South Edge [Member]	Sep. 30, 2013 Other Liabilities
Schedule of Equity Method Investments [Line Items]
Available-for-sale Securities	$ 24,700,000			$ 26,000,000
Unrealized loss related to available-for-sale securities	(1,276,000)	0	0
Cash and Pre-Owned Homes business contributed	13,576,000	44,997,000				300,000
Number of pre-owned homes						190
Number of pre-owned homes that were leased						187
Beazer homes' ownership interest	100.00%					23.50%
Cost-method Investments, Realized Gains					6,300,000
Settlement of Unconsolidated JV Debt Obligation	0	500,000	15,862,000				1,000,000
Joint Venture Obligation							5,700,000
Beazer's estimate of its maximum exposure to our repayment guarantees								700,000
Guarantor Obligation, Settlement, Payment	500,000
Guarantor Obligation, Settlement, Other Income (Expense)	$ 200,000