Debt Instrument, Covenant, Interest Collateral Ratio, Minimum

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Debt Instrument, Covenant, Interest Coverage Ratio, Minimum

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Debt Instrument, Covenant, Liquidity Amount, Minimum

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Debt Instrument, Covenant, Liquidity Amount, Minimum, Under Secondary Requirements

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Debt Instrument, Interest Rate, Effective Period

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Line of Credit Facility, Number of Lenders

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Ownership Interest In Guarantor Subsidiaries

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Senior Unsecured Term Loan [Abstract]

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments including both interest and principal payments.

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Weighted average interest rate of debt outstanding.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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Borrowings - Narrative (Details)			3 Months Ended								12 Months Ended
Borrowings - Narrative (Details)	Oct. 08, 2020 USD ($)	Sep. 09, 2019 USD ($)	Sep. 30, 2020 USD ($) lender	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2020 USD ($) lender	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	May 31, 2018 USD ($)	Jan. 31, 2010 USD ($)	Jun. 15, 2006
Senior Notes [Abstract]
Beazer homes' ownership interest in guarantor subsidiaries			100.00%								100.00%
Loss on extinguishment of debt, net			$ 0	$ 0	$ 0	$ 0	$ 25,494,000	$ (358,000)	$ (216,000)	$ 0	$ 0	$ 24,920,000	$ 27,839,000
Senior Notes \| Senior Unsecured Term Loans September 2022
Senior Unsecured Term Loan [Abstract]
Periodic payment		$ 50,000,000.0
Junior Subordinated Notes [Abstract]
Debt instrument stated interest rate (percent)		4.875%
Aggregate principal amount of debt		$ 100,000,000.0
Junior Subordinated Notes
Junior Subordinated Notes [Abstract]
Debt instrument stated interest rate (percent)																7.987%
Weighted average fixed interest rate of debt (percent)			4.25%								4.25%
Effective period of debt instrument interest rate											10 years
Aggregate principal amount of debt															$ 75,000,000.0
Secured Revolving Credit Facility
Line of Credit Facility [Abstract]
Maximum borrowing capacity			$ 250,000,000.0								$ 250,000,000.0
Line of credit facility, number of lenders \| lender			4								4
Inventory assets pledged as collateral			$ 1,100,000,000								$ 1,100,000,000
Secured Revolving Credit Facility			0				0				0	0
Letters of credit secured using cash collateral			0				0				0	0
Line of credit facility, remaining borrowing capacity			250,000,000.0								250,000,000.0
Secured Revolving Credit Facility \| Subsequent Event
Line of Credit Facility [Abstract]
Maximum borrowing capacity	$ 300,000,000.0
Covenant, liquidity amount, minimum	$ 50,000,000.0
Covenant, interest coverage ratio, minimum	1.00
Covenant, interest collateral ratio, minimum	1.75
Covenant, liquidity amount, minimum, under secondary requirements	$ 100,000,000.0
Letter of Credit
Line of Credit Facility [Abstract]
Letters of credit secured using cash collateral			12,700,000				$ 14,100,000				12,700,000	$ 14,100,000
Standby Letters of Credit \| Issuance Capacity
Line of Credit Facility [Abstract]
Maximum borrowing capacity														$ 50,000,000.0
Standby Letters of Credit \| Standby Letter for Credit Facility
Line of Credit Facility [Abstract]
Letters of credit secured using cash collateral			$ 36,100,000								$ 36,100,000
Standby Letters of Credit \| Backstop Standby Letters of Credit
Line of Credit Facility [Abstract]
Maximum borrowing capacity														$ 40,000,000.0