Supplemental Guarantor Information - Unaudited Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 489,413	$ 421,260	$ 907,217	$ 823,300
Home construction and land sales expenses	410,568	356,329	765,235	696,707
Inventory impairments and abandonments	0	147,611	0	148,618
Gross profit (loss)	78,845	(82,680)	141,982	(22,025)
Commissions	18,744	15,998	34,809	31,735
General and administrative expenses	40,050	37,372	79,749	76,014
Depreciation and amortization	3,627	2,900	7,054	5,670
Operating income (loss)	16,424	(138,950)	20,370	(135,444)
Equity in income of unconsolidated entities	147	81	134	17
Gain on extinguishment of debt	0	216	0	216
Other (expense) income, net	(1,786)	(337)	(3,126)	(379)
Income (loss) from continuing operations before income taxes	14,785	(138,990)	17,378	(135,590)
(Benefit) expense from income taxes	4,170	(38,158)	3,959	(42,080)
Equity in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	10,615	(100,832)	13,419	(93,510)
Loss from discontinued operations, net of tax	(1)	(30)	(59)	(41)
Equity in loss of subsidiaries from discontinued operations	0	0	0	0
Net income (loss)	10,614	(100,862)	13,360	(93,551)
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Total revenue	0	0	0	(115)
Home construction and land sales expenses	0	0	0	(115)
Inventory impairments and abandonments		0		0
Gross profit (loss)	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 income (loss)	0	0	0	0
Equity in income of unconsolidated entities	0	0	0	0
Gain on extinguishment of debt		0		0
Other (expense) income, net	0	0	0	0
Income (loss) from continuing operations before income taxes	0	0	0	0
(Benefit) expense from income taxes	0	0	0	0
Equity in income of subsidiaries	(29,601)	78,257	(51,616)	32,871
Income (loss) from continuing operations	(29,601)	78,257	(51,616)	32,871
Loss from discontinued operations, net of tax	0	0	0	0
Equity in loss of subsidiaries from discontinued operations	1	30	59	41
Net income (loss)	(29,600)	78,287	(51,557)	32,912
Beazer Homes USA, Inc.
Condensed Financial Statements, Captions [Line Items]
Gain on extinguishment of debt		216		216
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	22,660	18,544	42,329	35,867
Inventory impairments and abandonments		13,792		13,908
Gross profit (loss)	(22,660)	(32,336)	(42,329)	(49,775)
Commissions	0	0	0	0
General and administrative expenses	0	0	0	0
Depreciation and amortization	0	0	0	0
Operating income (loss)	(22,660)	(32,336)	(42,329)	(49,775)
Equity in income of unconsolidated entities	0	0	0	0
Other (expense) income, net	(1,928)	(597)	(3,370)	(839)
Income (loss) from continuing operations before income taxes	(24,588)	(32,717)	(45,699)	(50,398)
(Benefit) expense from income taxes	(5,602)	(10,142)	(7,502)	10,241
Equity in income of subsidiaries	29,601	(78,257)	51,616	(32,871)
Income (loss) from continuing operations	10,615	(100,832)	13,419	(93,510)
Loss from discontinued operations, net of tax	0	0	0	0
Equity in loss of subsidiaries from discontinued operations	(1)	(30)	(59)	(41)
Net income (loss)	10,614	(100,862)	13,360	(93,551)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Gain on extinguishment of debt		0		0
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Total revenue	489,413	421,260	907,217	823,300
Home construction and land sales expenses	387,908	337,785	722,906	660,955
Inventory impairments and abandonments		133,819		134,710
Gross profit (loss)	101,505	(50,344)	184,311	27,635
Commissions	18,744	15,998	34,809	31,735
General and administrative expenses	40,050	37,372	79,749	76,018
Depreciation and amortization	3,627	2,900	7,054	5,670
Operating income (loss)	39,084	(106,614)	62,699	(85,788)
Equity in income of unconsolidated entities	147	81	134	17
Other (expense) income, net	142	260	244	464
Income (loss) from continuing operations before income taxes	39,373	(106,273)	63,077	(85,307)
(Benefit) expense from income taxes	9,772	(28,016)	11,461	(52,350)
Equity in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	29,601	(78,257)	51,616	(32,957)
Loss from discontinued operations, net of tax	8	(25)	(41)	(31)
Equity in loss of subsidiaries from discontinued operations	0	0	0	0
Net income (loss)	29,609	(78,282)	51,575	(32,988)
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Gain on extinguishment of debt		0		0
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Total revenue	0	0	0	115
Home construction and land sales expenses	0	0	0	0
Inventory impairments and abandonments		0		0
Gross profit (loss)	0	0	0	115
Commissions	0	0	0	0
General and administrative expenses	0	0	0	(4)
Depreciation and amortization	0	0	0	0
Operating income (loss)	0	0	0	119
Equity in income of unconsolidated entities	0	0	0	0
Other (expense) income, net	0	0	0	(4)
Income (loss) from continuing operations before income taxes	0	0	0	115
(Benefit) expense from income taxes	0	0	0	29
Equity in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	0	0	0	86
Loss from discontinued operations, net of tax	(9)	(5)	(18)	(10)
Equity in loss of subsidiaries from discontinued operations	0	0	0	0
Net income (loss)	$ (9)	$ (5)	$ (18)	$ 76