Borrowings - Narrative (Details) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended						1 Months Ended											1 Months Ended	3 Months Ended						9 Months Ended			9 Months Ended	12 Months Ended								1 Months Ended		1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013	Mar. 31, 2014 Tangible Equity Units	Mar. 31, 2013 Senior Notes [Member]	Jun. 30, 2014 Senior Notes [Member]	Sep. 30, 2013 Senior Notes [Member]	Jun. 30, 2014 Senior Notes [Member] 5 3/4% Senior Notes Maturing June 2019 [Member]	Apr. 03, 2014 Senior Notes [Member] 5 3/4% Senior Notes Maturing June 2019 [Member]	Jan. 31, 2014 Senior Notes [Member] 7 1/2% Senior Notes Maturing September 2021 [Member]	Jun. 30, 2014 Senior Notes [Member] 7 1/2% Senior Notes Maturing September 2021 [Member]	Sep. 30, 2013 Senior Notes [Member] 7 1/2% Senior Notes Maturing September 2021 [Member]	Jun. 30, 2014 Senior Notes [Member] 7 1/4% Senior Notes Maturing February 2023 [Member]	Sep. 30, 2013 Senior Notes [Member] 7 1/4% Senior Notes Maturing February 2023 [Member]	Feb. 01, 2013 Senior Notes [Member] 7 1/4% Senior Notes Maturing February 2023 [Member]	Jun. 30, 2014 Senior Notes [Member] 6.625% Senior Secured Notes	Sep. 30, 2013 Senior Notes [Member] 6.625% Senior Secured Notes	Jun. 30, 2014 Senior Notes [Member] 9 1/8% Senior Notes Maturing May 2019	Sep. 30, 2013 Senior Notes [Member] 9 1/8% Senior Notes Maturing May 2019	Sep. 30, 2013 Senior Notes [Member] 6 7/8% Senior Notes Maturing July 2015	Apr. 30, 2014 Senior Notes [Member] 9 1/8% Senior Notes Maturing June 2018	Jun. 30, 2014 Senior Notes [Member] 9 1/8% Senior Notes Maturing June 2018	Sep. 30, 2013 Senior Notes [Member] 9 1/8% Senior Notes Maturing June 2018	Jun. 30, 2014 Senior Notes [Member] 8 1/8% Senior Notes Maturing June 2016	Sep. 30, 2013 Senior Notes [Member] 8 1/8% Senior Notes Maturing June 2016	Mar. 31, 2014 Senior Notes [Member] Tangible Equity Units	Jul. 17, 2012 Senior Notes [Member] Tangible Equity Units TEUs	Jun. 30, 2014 Junior Subordinated Notes	Sep. 30, 2013 Junior Subordinated Notes	Jan. 15, 2010 Junior Subordinated Notes	Jun. 30, 2014 Cash Secured Loan	Sep. 30, 2013 Cash Secured Loan	Jun. 30, 2014 Other Secured Notes Payable	Sep. 30, 2013 Other Secured Notes Payable	Jun. 30, 2014 Secured Revolving Credit Facility	Sep. 30, 2013 Secured Revolving Credit Facility	Sep. 30, 2012 Secured Revolving Credit Facility	Jun. 30, 2014 Letter of Credit	Sep. 30, 2013 Letter of Credit	Mar. 31, 2014 Common Stock	Sep. 30, 2013 Optional Redemption Under Indenture [Member] Senior Notes [Member] 6 7/8% Senior Notes Maturing July 2015	Mar. 31, 2014 Debt Instrument, Convertible, Stock Price Trigger, Range Two [Member] Tangible Equity Units	Jul. 30, 2014 Subsequent Event [Member] Senior Notes [Member] 5 3/4% Senior Notes Maturing June 2019 [Member]
Line of Credit Facility [Abstract]
Credit facility borrowing capacity																																							$ 150,000,000	$ 220,000,000
Amount of available borrowings under the Secured Revolving Credit Facility																																					150,000,000
Inventory assets pledged as collateral																																					1,000,000,000
Outstanding borrowings under the Secured Revolving Credit Facility																																					0	0
Letters of credit secured using cash collateral																																								33,700,000	25,200,000
Senior Notes [Abstract]
Beazer homes' ownership interest in guarantor subsidiaries (less than 10% in Inspirada Builders LLC)	100.00%		100.00%
Minimum consolidated tangible net worth	85,000,000		85,000,000
Percentage of debt, at par, required to be offered for purchase								10.00%
Amount of original debt that could be repurchased								27,500,000
Consolidated tangible net worth	193,600,000		193,600,000														200,000,000
Aggregate principal amount of debt											325,000,000			200,000,000																103,100,000		75,000,000
Stated interest rate on debt instrument (percent)										5.75%	5.75%		7.50%	7.50%	7.25%	7.25%	7.25%	6.625%	6.625%	9.125%	9.125%	6.875%		9.125%	9.125%	8.125%	8.125%		7.50%	7.987%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed												100.00%																																	100.00%
Call price and make-whole premiums provided for by 2018 Notes																							17,200,000
Tangible Equity Units (TEUs) Converted during period units						890,000																																						1,252,675
Stock Exchange, Debt Related to Tangible Equity Unit																												2,400,000
Loss on extinguishment of debt	(19,764,000)	0	(19,917,000)	(3,638,000)			(3,600,000)																	(19,800,000)										1,000,000
Outstanding debt instrument principal amount redeemed																									2,000,000									205,000,000
Stock Issued During Period, Shares, Conversion of Units																																										1,368,108
Debt Issuance Discount														98.541%
Tangible Capital [Abstract]
Tangible Equity Units (TEUs) issued during period, (units)																													4,600,000
Junior Subordinated Notes [Abstract]
Effective period of debt instrument interest rate																														10 years
Debt instrument redemption price (percent)																																											101.146%
Unamortized accretion	4,590,000		4,590,000		5,160,000			4,590,000	5,160,000																					45,600,000
Secured Debt [Abstract]
Three-month LIBOR																																	LIBOR
Spread on variable interest rate (percent)																																	0.40%
Long-term debt	$ 1,537,242,000		$ 1,537,242,000		$ 1,512,183,000			$ 1,436,606,000	$ 1,416,860,000																					$ 55,220,000	$ 53,670,000		$ 22,368,000	$ 22,368,000	$ 23,048,000	$ 19,285,000
Weighted average fixed interest rate of debt (percent)																																			4.06%