Supplemental Guarantor Information - Unaudited Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 417,804	$ 402,040
Home construction and land sales expenses	354,667	340,378
Inventory impairments and abandonments	0	1,007
Gross profit	63,137	60,655
Commissions	16,065	15,737
General and administrative expenses	39,699	38,642
Depreciation and amortization	3,427	2,770
Operating income	3,946	3,506
Equity in loss of unconsolidated entities	(13)	(64)
Other (expense) income, net	(1,340)	(42)
Income from continuing operations before income taxes	2,593	3,400
(Benefit) expense from income taxes	(211)	(3,922)
Equity in income of subsidiaries	0	0
Income from continuing operations	2,804	7,322
Loss from discontinued operations, net of tax	(58)	(11)
Equity in loss of subsidiaries from discontinued operations	0	0
Net income	2,746	7,311
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Total revenue	0	(115)
Home construction and land sales expenses	0	(115)
Inventory impairments and abandonments		0
Gross profit	0	0
Commissions	0	0
General and administrative expenses	0	0
Depreciation and amortization	0	0
Operating income	0	0
Equity in loss of unconsolidated entities	0	0
Other (expense) income, net	0	0
Income from continuing operations before income taxes	0	0
(Benefit) expense from income taxes	0	0
Equity in income of subsidiaries	(22,015)	(45,387)
Income from continuing operations	(22,015)	(45,387)
Loss from discontinued operations, net of tax	0	0
Equity in loss of subsidiaries from discontinued operations	58	11
Net income	(21,957)	(45,376)
Beazer Homes USA, Inc. | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Total revenue	0	0
Home construction and land sales expenses	19,669	17,323
Inventory impairments and abandonments		115
Gross profit	(19,669)	(17,438)
Commissions	0	0
General and administrative expenses	0	0
Depreciation and amortization	0	0
Operating income	(19,669)	(17,438)
Equity in loss of unconsolidated entities	0	0
Other (expense) income, net	(1,442)	(242)
Income from continuing operations before income taxes	(21,111)	(17,680)
(Benefit) expense from income taxes	(1,900)	20,385
Equity in income of subsidiaries	22,015	45,387
Income from continuing operations	2,804	7,322
Loss from discontinued operations, net of tax	0	0
Equity in loss of subsidiaries from discontinued operations	(58)	(11)
Net income	2,746	7,311
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Total revenue	417,804	402,040
Home construction and land sales expenses	334,998	323,170
Inventory impairments and abandonments		892
Gross profit	82,806	77,978
Commissions	16,065	15,737
General and administrative expenses	39,699	38,646
Depreciation and amortization	3,427	2,770
Operating income	23,615	20,825
Equity in loss of unconsolidated entities	(13)	(64)
Other (expense) income, net	102	204
Income from continuing operations before income taxes	23,704	20,965
(Benefit) expense from income taxes	1,689	(24,336)
Equity in income of subsidiaries	0	0
Income from continuing operations	22,015	45,301
Loss from discontinued operations, net of tax	(49)	(7)
Equity in loss of subsidiaries from discontinued operations	0	0
Net income	21,966	45,294
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Total revenue	0	115
Home construction and land sales expenses	0	0
Inventory impairments and abandonments		0
Gross profit	0	115
Commissions	0	0
General and administrative expenses	0	(4)
Depreciation and amortization	0	0
Operating income	0	119
Equity in loss of unconsolidated entities	0	0
Other (expense) income, net	0	(4)
Income from continuing operations before income taxes	0	115
(Benefit) expense from income taxes	0	29
Equity in income of subsidiaries	0	0
Income from continuing operations	0	86
Loss from discontinued operations, net of tax	(9)	(4)
Equity in loss of subsidiaries from discontinued operations	0	0
Net income	$ (9)	$ 82