Supplemental Guarantor Information - Unaudited Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 421,260	$ 455,178	$ 823,300	$ 827,667
Home construction and land sales expenses	356,329	380,101	696,707	691,761
Inventory impairments and abandonments	147,611	0	148,618	0
Gross (loss) profit	(82,680)	75,077	(22,025)	135,906
Commissions	15,998	17,334	31,735	31,690
General and administrative expenses	37,372	40,852	76,014	78,137
Depreciation and amortization	2,900	3,066	5,670	5,573
Operating (loss) income	(138,950)	13,825	(135,444)	20,506
Equity in income of unconsolidated entities	81	256	17	155
Gain (loss) on extinguishment of debt	216	0	216	(25,904)
Other (expense) income, net	(337)	(1,453)	(379)	(4,598)
Loss from continuing operations before income taxes	(138,990)	12,628	(135,590)	(9,841)
Benefit from income taxes	(38,158)	1,012	(42,080)	109,118
Equity in loss of subsidiaries	0	0	0	0
(Loss) income from continuing operations	(100,832)	11,616	(93,510)	(118,959)
Loss from discontinued operations, net of tax	(30)	(58)	(41)	(430)
Equity in loss of subsidiaries from discontinued operations	0	0	0	0
Net (loss) income	(100,862)	11,558	(93,551)	(119,389)
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Total revenue	0	(23)	(115)	(37)
Home construction and land sales expenses	0	(23)	(115)	(37)
Inventory impairments and abandonments	0		0
Gross (loss) profit	0	0	0	0
Commissions	0	0	0	0
General and administrative expenses	0	0	0	0
Depreciation and amortization	0	0	0	0
Operating (loss) income	0	0	0	0
Equity in income of unconsolidated entities	0	0	0	0
Gain (loss) on extinguishment of debt	0		0	0
Other (expense) income, net	0	0	0	0
Loss from continuing operations before income taxes	0	0	0	0
Benefit from income taxes	0	0	0	0
Equity in loss of subsidiaries	78,257	(27,211)	32,871	69,744
(Loss) income from continuing operations	78,257	(27,211)	32,871	69,744
Loss from discontinued operations, net of tax	0	0	0	0
Equity in loss of subsidiaries from discontinued operations	30	58	41	430
Net (loss) income	78,287	(27,153)	32,912	70,174
Beazer Homes USA, Inc. | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Total revenue	0	0	0	0
Home construction and land sales expenses	18,544	19,655	35,867	36,123
Inventory impairments and abandonments	13,792		13,908
Gross (loss) profit	(32,336)	(19,655)	(49,775)	(36,123)
Commissions	0	0	0	0
General and administrative expenses	0	0	0	0
Depreciation and amortization	0	0	0	0
Operating (loss) income	(32,336)	(19,655)	(49,775)	(36,123)
Equity in income of unconsolidated entities	0	0	0	0
Gain (loss) on extinguishment of debt	216		216	(25,904)
Other (expense) income, net	(597)	(1,650)	(839)	(5,085)
Loss from continuing operations before income taxes	(32,717)	(21,305)	(50,398)	(67,112)
Benefit from income taxes	(10,142)	(5,710)	10,241	(17,897)
Equity in loss of subsidiaries	(78,257)	27,211	(32,871)	(69,744)
(Loss) income from continuing operations	(100,832)	11,616	(93,510)	(118,959)
Loss from discontinued operations, net of tax	0	0	0	0
Equity in loss of subsidiaries from discontinued operations	(30)	(58)	(41)	(430)
Net (loss) income	(100,862)	11,558	(93,551)	(119,389)
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Total revenue	421,260	455,178	823,300	827,667
Home construction and land sales expenses	337,785	360,469	660,955	655,675
Inventory impairments and abandonments	133,819		134,710
Gross (loss) profit	(50,344)	94,709	27,635	171,992
Commissions	15,998	17,334	31,735	31,690
General and administrative expenses	37,372	40,823	76,018	78,067
Depreciation and amortization	2,900	3,066	5,670	5,573
Operating (loss) income	(106,614)	33,486	(85,788)	56,662
Equity in income of unconsolidated entities	81	256	17	155
Gain (loss) on extinguishment of debt	0		0	0
Other (expense) income, net	260	203	464	500
Loss from continuing operations before income taxes	(106,273)	33,945	(85,307)	57,317
Benefit from income taxes	(28,016)	6,725	(52,350)	127,029
Equity in loss of subsidiaries	0	0	0	0
(Loss) income from continuing operations	(78,257)	27,220	(32,957)	(69,712)
Loss from discontinued operations, net of tax	(25)	(52)	(31)	(421)
Equity in loss of subsidiaries from discontinued operations	0	0	0	0
Net (loss) income	(78,282)	27,168	(32,988)	(70,133)
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Total revenue	0	23	115	37
Home construction and land sales expenses	0	0	0	0
Inventory impairments and abandonments	0		0
Gross (loss) profit	0	23	115	37
Commissions	0	0	0	0
General and administrative expenses	0	29	(4)	70
Depreciation and amortization	0	0	0	0
Operating (loss) income	0	(6)	119	(33)
Equity in income of unconsolidated entities	0	0	0	0
Gain (loss) on extinguishment of debt	0		0	0
Other (expense) income, net	0	(6)	(4)	(13)
Loss from continuing operations before income taxes	0	(12)	115	(46)
Benefit from income taxes	0	(3)	29	(14)
Equity in loss of subsidiaries	0	0	0	0
(Loss) income from continuing operations	0	(9)	86	(32)
Loss from discontinued operations, net of tax	(5)	(6)	(10)	(9)
Equity in loss of subsidiaries from discontinued operations	0	0	0	0
Net (loss) income	$ (5)	$ (15)	$ 76	$ (41)