Supplemental Guarantor Information - Unaudited Condensed Consolidating Statements of Income (Loss) and Unaudited Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 455,178	$ 425,468	$ 827,667	$ 764,709
Home construction and land sales expenses	380,101	357,788	691,761	643,366
Inventory impairments and abandonments	0	282	0	282
Gross profit	75,077	67,398	135,906	121,061
Commissions	17,334	16,632	31,690	29,955
General and administrative expenses	40,852	40,100	78,137	76,488
Depreciation and amortization	3,066	3,155	5,573	5,832
Operating income	13,825	7,511	20,506	8,786
Equity in income of unconsolidated entities	256	33	155	55
Loss on extinguishment of debt	0	(15,563)	(25,904)	(15,563)
Other (expense) income, net	(1,453)	(3,940)	(4,598)	(9,136)
(Loss) income before income taxes	12,628	(11,959)	(9,841)	(15,858)
(Benefit) expense from income taxes	1,012	(4,464)	109,118	(7,004)
Equity in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	11,616	(7,495)	(118,959)	(8,854)
Loss from discontinued operations, net of tax	(58)	(40)	(430)	(110)
Equity in loss of subsidiaries from discontinued operations	0	0	0	0
Net income (loss) and comprehensive income (loss)	11,558	(7,535)	(119,389)	(8,964)
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Total revenue	(23)	(24)	(37)	(60)
Home construction and land sales expenses	(23)	(24)	(37)	(60)
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	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	(27,211)	(17,455)	69,744	(29,422)
Income (loss) from continuing operations	(27,211)	(17,455)	69,744	(29,422)
Loss from discontinued operations, net of tax	0	0	0	0
Equity in loss of subsidiaries from discontinued operations	58	40	430	110
Net income (loss) and comprehensive income (loss)	(27,153)	(17,415)	70,174	(29,312)
Beazer Homes USA, Inc.
Condensed Financial Statements, Captions [Line Items]
Total revenue	0	0	0	0
Home construction and land sales expenses	19,655	19,819	36,123	35,463
Inventory impairments and abandonments		0		0
Gross profit	(19,655)	(19,819)	(36,123)	(35,463)
Commissions	0	0	0	0
General and administrative expenses	0	0	0	0
Depreciation and amortization	0	0	0	0
Operating income	(19,655)	(19,819)	(36,123)	(35,463)
Equity in income of unconsolidated entities	0	0	0	0
Loss on extinguishment of debt		(15,563)	(25,904)	(15,563)
Other (expense) income, net	(1,650)	(4,046)	(5,085)	(9,298)
(Loss) income before income taxes	(21,305)	(39,428)	(67,112)	(60,324)
(Benefit) expense from income taxes	(5,710)	(14,478)	(17,897)	(22,048)
Equity in income of subsidiaries	27,211	17,455	(69,744)	29,422
Income (loss) from continuing operations	11,616	(7,495)	(118,959)	(8,854)
Loss from discontinued operations, net of tax	0	0	0	0
Equity in loss of subsidiaries from discontinued operations	(58)	(40)	(430)	(110)
Net income (loss) and comprehensive income (loss)	11,558	(7,535)	(119,389)	(8,964)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total revenue	455,178	425,468	827,667	764,709
Home construction and land sales expenses	360,469	337,993	655,675	607,963
Inventory impairments and abandonments		282		282
Gross profit	94,709	87,193	171,992	156,464
Commissions	17,334	16,632	31,690	29,955
General and administrative expenses	40,823	40,071	78,067	76,436
Depreciation and amortization	3,066	3,155	5,573	5,832
Operating income	33,486	27,335	56,662	44,241
Equity in income of unconsolidated entities	256	33	155	55
Loss on extinguishment of debt		0	0	0
Other (expense) income, net	203	114	500	171
(Loss) income before income taxes	33,945	27,482	57,317	44,467
(Benefit) expense from income taxes	6,725	10,019	127,029	15,044
Equity in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	27,220	17,463	(69,712)	29,423
Loss from discontinued operations, net of tax	(52)	(34)	(421)	(101)
Equity in loss of subsidiaries from discontinued operations	0	0	0	0
Net income (loss) and comprehensive income (loss)	27,168	17,429	(70,133)	29,322
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total revenue	23	24	37	60
Home construction and land sales expenses	0	0	0	0
Inventory impairments and abandonments		0		0
Gross profit	23	24	37	60
Commissions	0	0	0	0
General and administrative expenses	29	29	70	52
Depreciation and amortization	0	0	0	0
Operating income	(6)	(5)	(33)	8
Equity in income of unconsolidated entities	0	0	0	0
Loss on extinguishment of debt		0	0	0
Other (expense) income, net	(6)	(8)	(13)	(9)
(Loss) income before income taxes	(12)	(13)	(46)	(1)
(Benefit) expense from income taxes	(3)	(5)	(14)	0
Equity in income of subsidiaries	0	0	0	0
Income (loss) from continuing operations	(9)	(8)	(32)	(1)
Loss from discontinued operations, net of tax	(6)	(6)	(9)	(9)
Equity in loss of subsidiaries from discontinued operations	0	0	0	0
Net income (loss) and comprehensive income (loss)	$ (15)	$ (14)	$ (41)	$ (10)