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Borrowings - Narrative (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  | 9 Months Ended |  |  |  |  |  |  |  |  |  | 3 Months Ended |  | 3 Months Ended | 9 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2012 Tangible Equity Units TEUs | Jun. 30, 2013 Senior Notes | Sep. 30, 2012 Senior Notes | Jun. 30, 2013 Senior Notes 7 1/4% Senior Notes Maturing February 2023 [Member] | Feb. 01, 2013 Senior Notes 7 1/4% Senior Notes Maturing February 2023 [Member] | Sep. 30, 2012 Senior Notes 7 1/4% Senior Notes Maturing February 2023 [Member] | Jun. 30, 2013 Senior Notes 6.625% Senior Secured Notes | Sep. 30, 2012 Senior Notes 6.625% Senior Secured Notes | Jun. 30, 2013 Senior Notes 9 1/8% Senior Notes Maturing May 2019 | Sep. 30, 2012 Senior Notes 9 1/8% Senior Notes Maturing May 2019 | Jun. 30, 2013 Senior Notes 6 7/8% Senior Notes Maturing July 2015 | Sep. 30, 2012 Senior Notes 6 7/8% Senior Notes Maturing July 2015 | Jun. 30, 2013 Senior Notes 9 1/8% Senior Notes Maturing June 2018 | Sep. 30, 2012 Senior Notes 9 1/8% Senior Notes Maturing June 2018 | Jun. 30, 2013 Senior Notes 8 1/8% Senior Notes Maturing June 2016 | Sep. 30, 2012 Senior Notes 8 1/8% Senior Notes Maturing June 2016 | Jun. 30, 2012 Senior Notes Tangible Equity Units | Jul. 17, 2012 Senior Notes Tangible Equity Units TEUs | Mar. 31, 2012 Senior Notes Tangible Equity Units TEUs | May 31, 2010 Senior Notes Tangible Equity Units TEUs | Jun. 30, 2013 Convertible Subordinated Debt | Sep. 30, 2012 Convertible Subordinated Debt | Jun. 30, 2012 Convertible Subordinated Debt 7 1/2% Mandatory Convertible Subordinated Notes [Member] | Mar. 31, 2012 Convertible Subordinated Debt 7 1/2% Mandatory Convertible Subordinated Notes [Member] | Jun. 30, 2013 Convertible Subordinated Debt 7 1/2% Mandatory Convertible Subordinated Notes [Member] | Jan. 12, 2010 Convertible Subordinated Debt 7 1/2% Mandatory Convertible Subordinated Notes [Member] | Jun. 30, 2013 Junior Subordinated Notes | Sep. 30, 2012 Junior Subordinated Notes | Jan. 15, 2010 Junior Subordinated Notes | Jun. 15, 2006 Junior Subordinated Notes | Jun. 30, 2013 Cash Secured Loan | Sep. 30, 2012 Cash Secured Loan | Jun. 30, 2013 Other Secured Notes Payable | Sep. 30, 2012 Other Secured Notes Payable | Jun. 30, 2013 Secured Revolving Credit Facility | Sep. 30, 2012 Secured Revolving Credit Facility | Jun. 30, 2012 Secured Revolving Credit Facility | Jun. 30, 2013 Letter of Credit | Sep. 30, 2012 Letter of Credit | Jun. 30, 2013 Minimum [Member] Senior Notes 7 1/4% Senior Notes Maturing February 2023 [Member] | Jun. 30, 2013 Maximum Senior Notes 7 1/4% Senior Notes Maturing February 2023 [Member] | Jun. 30, 2013 Common Stock | Jun. 30, 2012 Common Stock | Mar. 31, 2012 Common Stock | Jun. 30, 2013 In Compliance [Member] Senior Notes 7 1/4% Senior Notes Maturing February 2023 [Member] | Jun. 30, 2013 Optional Redemption Under Indenture [Member] Senior Notes 7 1/4% Senior Notes Maturing February 2023 [Member] | Jun. 30, 2013 Optional Redemption Under Indenture [Member] Senior Notes 6 7/8% Senior Notes Maturing July 2015 | Jun. 30, 2013 Subsequent Event Common Stock | Mar. 31, 2013 Subsequent Event Common Stock | Jun. 30, 2013 Debt Instrument, Convertible, Stock Price Trigger Range One [Member] 7 1/2% Mandatory Convertible Subordinated Notes [Member] | Jun. 30, 2013 Debt Instrument, Convertible, Stock Price Trigger, Range Two [Member] 7 1/2% Mandatory Convertible Subordinated Notes [Member]
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 | $ 22,000,000 | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,700,000 | 24,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beazer homes' ownership interest in guarantor subsidiaries (less than 10% in Inspirada Builders LLC) | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of original debt amount required to be offered for repurchase (percent) |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |
Minimum consolidated tangible net worth | 85,000,000 |  | 85,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of original debt that could be repurchased |  |  |  |  |  |  | 27,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated tangible net worth | 202,400,000 |  | 202,400,000 |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,500,000 |  |  | 75,000,000 | 103,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument stated interest rate (percent) |  |  |  |  |  |  |  |  | 7.25% | 7.25% | 0.00% | 6.625% | 6.625% | 9.125% | 9.125% | 6.875% | 6.875% | 9.125% | 9.125% | 8.125% | 8.125% |  | 7.50% |  | 7.25% |  |  |  |  |  |  | 7.987% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | 0 | 0 | (3,638,000) | (2,747,000) |  |  | (3,600,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt instrument principal amount redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares exchanged for common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.8 |  |  |  |  |  |  |
Tangible Capital [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Stock Price Trigger |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.50 | $ 17.75
Tangible Equity Units (TEUs) issued during period, (units) |  |  |  |  |  | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,600,000 | 2,800,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior amortizing notes exchanged for Tangible Equity Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Subordinated Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed conversion ratio (shares per $25) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.8909 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.72414 | 1.40746
Number of common stock exchanged for debt (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.6 | 2.2 | 2.2 |  |  |  | 0.4 | 0.4 |  |
Value of convertible debt exchanged for common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,100,000 | 48,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inducement expense recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective period of debt instrument interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument redemption price (percent) |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 103.625% |  |  |  | 101.00% | 107.25% | 101.146% |  |  |  |
Unamortized accretion | 2,341,000 |  | 2,341,000 |  | 3,082,000 |  | 2,341,000 | 3,082,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (47,600,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three-month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 1,505,656,000 |  | $ 1,505,656,000 |  | $ 1,498,198,000 |  | $ 1,221,647,000 | $ 1,201,067,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 9,402,000 |  |  | $ 9,400,000 |  | $ 53,153,000 | $ 51,603,000 |  |  | $ 222,368,000 | $ 227,368,000 | $ 8,488,000 | $ 8,758,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fixed interest rate of debt (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.91% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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