Supplemental Guarantor Information - Unaudited Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 402,040	$ 372,489
Home construction and land sales expenses	340,378	311,660
Inventory impairments and abandonments	1,007	0
Gross profit	60,655	60,829
Commissions	15,737	14,356
General and administrative expenses	38,642	37,285
Depreciation and amortization	2,770	2,507
Operating income	3,506	6,681
Equity in loss of unconsolidated entities	(64)	(101)
Loss on extinguishment of debt	0	(25,904)
Other (expense) income, net	(42)	(3,145)
(Loss) income from continuing operations before income taxes	3,400	(22,469)
Expense (benefit) from income taxes	(3,922)	108,106
Equity in income of subsidiaries	0	0
Income (loss) from continuing operations	7,322	(130,575)
Loss from discontinued operations	(11)	(372)
Equity in loss of subsidiaries from discontinued operations	0	0
Net income (loss)	7,311	(130,947)
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Total revenue	(115)	(14)
Home construction and land sales expenses	(115)	(14)
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
Loss on extinguishment of debt		0
Other (expense) income, net	0	0
(Loss) income from continuing operations before income taxes	0	0
Expense (benefit) from income taxes	0	0
Equity in income of subsidiaries	(45,387)	96,953
Income (loss) from continuing operations	(45,387)	96,953
Loss from discontinued operations	0	0
Equity in loss of subsidiaries from discontinued operations	11	372
Net income (loss)	(45,376)	97,325
Beazer Homes USA, Inc.
Condensed Financial Statements, Captions [Line Items]
Total revenue	0	0
Home construction and land sales expenses	17,323	16,468
Inventory impairments and abandonments	115
Gross profit	(17,438)	(16,468)
Commissions	0	0
General and administrative expenses	0	0
Depreciation and amortization	0	0
Operating income	(17,438)	(16,468)
Equity in loss of unconsolidated entities	0	0
Loss on extinguishment of debt		(25,904)
Other (expense) income, net	(242)	(3,435)
(Loss) income from continuing operations before income taxes	(17,680)	(45,807)
Expense (benefit) from income taxes	20,385	(12,185)
Equity in income of subsidiaries	45,387	(96,953)
Income (loss) from continuing operations	7,322	(130,575)
Loss from discontinued operations	0	0
Equity in loss of subsidiaries from discontinued operations	(11)	(372)
Net income (loss)	7,311	(130,947)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total revenue	402,040	372,489
Home construction and land sales expenses	323,170	295,206
Inventory impairments and abandonments	892
Gross profit	77,978	77,283
Commissions	15,737	14,356
General and administrative expenses	38,646	37,244
Depreciation and amortization	2,770	2,507
Operating income	20,825	23,176
Equity in loss of unconsolidated entities	(64)	(101)
Loss on extinguishment of debt		0
Other (expense) income, net	204	296
(Loss) income from continuing operations before income taxes	20,965	23,371
Expense (benefit) from income taxes	(24,336)	120,303
Equity in income of subsidiaries	0	0
Income (loss) from continuing operations	45,301	(96,932)
Loss from discontinued operations	(7)	(369)
Equity in loss of subsidiaries from discontinued operations	0	0
Net income (loss)	45,294	(97,301)
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total revenue	115	14
Home construction and land sales expenses	0	0
Inventory impairments and abandonments	0
Gross profit	115	14
Commissions	0	0
General and administrative expenses	(4)	41
Depreciation and amortization	0	0
Operating income	119	(27)
Equity in loss of unconsolidated entities	0	0
Loss on extinguishment of debt		0
Other (expense) income, net	(4)	(6)
(Loss) income from continuing operations before income taxes	115	(33)
Expense (benefit) from income taxes	29	(12)
Equity in income of subsidiaries	0	0
Income (loss) from continuing operations	86	(21)
Loss from discontinued operations	(4)	(3)
Equity in loss of subsidiaries from discontinued operations	0	0
Net income (loss)	$ 82	$ (24)