Supplemental Guarantor Information - Unaudited Condensed Consolidating Statements of Income (Loss) and Unaudited Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 511,521	$ 478,588	$ 1,339,188	$ 1,243,297
Home construction and land sales expenses	428,109	399,675	1,119,870	1,043,041
Inventory impairments and abandonments	168	470	168	752
Gross profit	83,244	78,443	219,150	199,504
Commissions	19,535	18,773	51,225	48,728
General and administrative expenses	42,473	40,794	120,610	117,282
Depreciation and amortization	3,656	3,307	9,229	9,139
Operating income	17,580	15,569	38,086	24,355
Equity in income of unconsolidated entities	147	158	302	213
Loss on extinguishment of debt	0	0	(25,904)	(15,563)
Other (expense) income, net	(30)	(2,871)	(4,628)	(12,007)
(Loss) income before income taxes	17,697	12,856	7,856	(3,002)
(Benefit) expense from income taxes	4,268	5,742	113,386	(1,262)
Equity in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	13,429	7,114	(105,530)	(1,740)
Income (loss) from discontinued operations, net of tax	(20)	9	(450)	(101)
Equity in income of subsidiaries from discontinued operations		0	0	0
Net income (loss) and comprehensive income (loss)	13,409	7,123	(105,980)	(1,841)
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Total revenue	(23)	(24)	(60)	(84)
Home construction and land sales expenses	(23)	(24)	(60)	(84)
Inventory impairments and abandonments		0		0
Gross 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 income	0	0	0	0
Equity in income of unconsolidated entities	0	0	0	0
Loss on extinguishment of debt			0	0
Other (expense) income, net	0	0	0	0
(Loss) income before income taxes	0	0	0	0
(Benefit) expense from income taxes	0	0	0	0
Equity in income of subsidiaries	(30,005)	(22,843)	39,739	(52,264)
Income (loss) from continuing operations	(30,005)	(22,843)	39,739	(52,264)
Income (loss) from discontinued operations, net of tax		0	0	0
Equity in income of subsidiaries from discontinued operations	20	(9)	450	101
Net income (loss) and comprehensive income (loss)	(29,985)	(22,852)	40,189	(52,163)
Beazer Homes USA, Inc.
Condensed Financial Statements, Captions [Line Items]
Total revenue	0	0	0	0
Home construction and land sales expenses	22,441	21,895	58,564	57,358
Inventory impairments and abandonments		0		0
Gross profit	(22,441)	(21,895)	(58,564)	(57,358)
Commissions	0	0	0	0
General and administrative expenses	0	0	0	0
Depreciation and amortization	0	0	0	0
Operating income	(22,441)	(21,895)	(58,564)	(57,358)
Equity in income of unconsolidated entities	0	0	0	0
Loss on extinguishment of debt			(25,904)	(15,563)
Other (expense) income, net	(204)	(2,934)	(5,289)	(12,231)
(Loss) income before income taxes	(22,645)	(24,829)	(89,757)	(85,152)
(Benefit) expense from income taxes	(6,069)	(9,100)	(23,966)	(31,148)
Equity in income of subsidiaries	30,005	22,843	(39,739)	52,264
Income (loss) from continuing operations	13,429	7,114	(105,530)	(1,740)
Income (loss) from discontinued operations, net of tax		0	0	0
Equity in income of subsidiaries from discontinued operations	(20)	9	(450)	(101)
Net income (loss) and comprehensive income (loss)	13,409	7,123	(105,980)	(1,841)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total revenue	511,521	478,588	1,339,188	1,243,297
Home construction and land sales expenses	405,691	377,804	1,061,366	985,767
Inventory impairments and abandonments		470		752
Gross profit	105,662	100,314	277,654	256,778
Commissions	19,535	18,773	51,225	48,728
General and administrative expenses	42,445	40,767	120,513	117,204
Depreciation and amortization	3,656	3,307	9,229	9,139
Operating income	40,026	37,467	96,687	81,707
Equity in income of unconsolidated entities	147	158	302	213
Loss on extinguishment of debt			0	0
Other (expense) income, net	187	71	687	241
(Loss) income before income taxes	40,360	37,696	97,676	82,161
(Benefit) expense from income taxes	10,341	14,846	137,370	29,890
Equity in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	30,019	22,850	(39,694)	52,271
Income (loss) from discontinued operations, net of tax	(11)	17	(432)	(84)
Equity in income of subsidiaries from discontinued operations		0	0	0
Net income (loss) and comprehensive income (loss)	30,008	22,867	(40,126)	52,187
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total revenue	23	24	60	84
Home construction and land sales expenses	0	0	0	0
Inventory impairments and abandonments		0		0
Gross profit	23	24	60	84
Commissions	0	0	0	0
General and administrative expenses	28	27	97	78
Depreciation and amortization	0	0	0	0
Operating income	(5)	(3)	(37)	6
Equity in income of unconsolidated entities	0	0	0	0
Loss on extinguishment of debt			0	0
Other (expense) income, net	(13)	(8)	(26)	(17)
(Loss) income before income taxes	(18)	(11)	(63)	(11)
(Benefit) expense from income taxes	(4)	(4)	(18)	(4)
Equity in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	(14)	(7)	(45)	(7)
Income (loss) from discontinued operations, net of tax	(9)	(8)	(18)	(17)
Equity in income of subsidiaries from discontinued operations		0	0	0
Net income (loss) and comprehensive income (loss)	$ (23)	$ (15)	$ (63)	$ (24)