Supplemental Guarantor Information - Consolidating Statement of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 632,121	$ 459,937	$ 385,607	$ 344,449	$ 632,852	$ 429,438	$ 299,359	$ 265,764	$ 1,822,114	$ 1,627,413	$ 1,463,767
Home construction and land sales expenses									1,509,625	1,351,860	1,192,001
Inventory impairments and abandonments	184	11,917	1,825	1,356	2,860	249	0	0	15,282	3,109	8,307
Gross profit	102,406	77,653	59,566	57,582	107,205	76,108	53,913	35,218	297,207	272,444	263,459
Commissions									70,460	65,023	58,028
General and administrative expenses									153,628	142,496	136,463
Depreciation and amortization									13,794	13,338	13,279
Operating income	30,838	16,309	3,030	9,148	36,945	17,696	6,436	(9,490)	59,325	51,587	55,689
Equity in income of unconsolidated entities									131	536	6,545
Loss on extinguishment of debt	(11,393)	429	(1,631)	(828)	(80)	0	0	0	(13,423)	(80)	(19,917)
Other expense, net									(24,330)	(30,013)	(49,191)
Income (loss) from continuing operations before income taxes									21,703	22,030	(6,874)
Expense (benefit) from income taxes									16,498	(324,569)	(41,797)
Equity in income of subsidiaries									0	0	0
Income from continuing operations	$ (789)	$ 6,107	$ (1,312)	$ 1,199	$ 354,524	$ 12,221	$ (2,060)	$ (18,086)	5,205	346,599	34,923
Loss from discontinued operations, net of tax									(512)	(2,505)	(540)
Equity in loss of subsidiaries									0	0	0
Net income									4,693	344,094	34,383
Change in unrealized loss related to available-for-sale securities									0	1,276	(1,276)
Total Comprehensive Income									4,693	345,370	33,107
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Total revenue									(156)	(198)	(379)
Home construction and land sales expenses									(156)	(198)	(379)
Inventory impairments and abandonments									0	0	0
Gross profit									0	0	0
Commissions									0	0	0
General and administrative expenses									0	0	0
Depreciation and amortization									0	0	0
Operating income									0	0	0
Equity in income of unconsolidated entities									0	0	0
Loss on extinguishment of debt									0	0	0
Other expense, net									0	0	0
Income (loss) from continuing operations before income taxes									0	0	0
Expense (benefit) from income taxes									0	0	0
Equity in income of subsidiaries									(52,541)	(399,162)	(130,879)
Income from continuing operations									(52,541)	(399,162)	(130,879)
Loss from discontinued operations, net of tax									0	0	0
Equity in loss of subsidiaries									512	2,505	540
Net income									(52,029)	(396,657)	(130,339)
Change in unrealized loss related to available-for-sale securities										0	0
Total Comprehensive Income										(396,657)	(130,339)
Beazer Homes USA, Inc.
Condensed Financial Statements, Captions [Line Items]
Total revenue									0	0	0
Home construction and land sales expenses									77,941	55,006	39,255
Inventory impairments and abandonments									710	0	245
Gross profit									(78,651)	(55,006)	(39,500)
Commissions									0	0	0
General and administrative expenses									0	0	0
Depreciation and amortization									0	0	0
Operating income									(78,651)	(55,006)	(39,500)
Equity in income of unconsolidated entities									0	0	0
Loss on extinguishment of debt									(13,423)	(80)	(19,917)
Other expense, net									(25,388)	(29,752)	(50,786)
Income (loss) from continuing operations before income taxes									(117,462)	(84,838)	(110,203)
Expense (benefit) from income taxes									(70,126)	(32,275)	(14,247)
Equity in income of subsidiaries									52,541	399,162	130,879
Income from continuing operations									5,205	346,599	34,923
Loss from discontinued operations, net of tax									0	0	0
Equity in loss of subsidiaries									(512)	(2,505)	(540)
Net income									4,693	344,094	34,383
Change in unrealized loss related to available-for-sale securities										1,276	(1,276)
Total Comprehensive Income										345,370	33,107
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total revenue									1,822,114	1,627,413	1,463,767
Home construction and land sales expenses									1,431,840	1,297,052	1,153,125
Inventory impairments and abandonments									14,572	3,109	8,062
Gross profit									375,702	327,252	302,580
Commissions									70,460	65,023	58,028
General and administrative expenses									153,524	142,391	136,349
Depreciation and amortization									13,794	13,338	13,279
Operating income									137,924	106,500	94,924
Equity in income of unconsolidated entities									131	536	6,545
Loss on extinguishment of debt									0	0	0
Other expense, net									1,061	(258)	1,600
Income (loss) from continuing operations before income taxes									139,116	106,778	103,069
Expense (benefit) from income taxes									86,605	(292,326)	(27,642)
Equity in income of subsidiaries									0	0	0
Income from continuing operations									52,511	399,104	130,711
Loss from discontinued operations, net of tax									(503)	(2,495)	(532)
Equity in loss of subsidiaries									0	0	0
Net income									52,008	396,609	130,179
Change in unrealized loss related to available-for-sale securities										0	0
Total Comprehensive Income										396,609	130,179
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total revenue									156	198	379
Home construction and land sales expenses									0	0	0
Inventory impairments and abandonments									0	0	0
Gross profit									156	198	379
Commissions									0	0	0
General and administrative expenses									104	105	114
Depreciation and amortization									0	0	0
Operating income									52	93	265
Equity in income of unconsolidated entities									0	0	0
Loss on extinguishment of debt									0	0	0
Other expense, net									(3)	(3)	(5)
Income (loss) from continuing operations before income taxes									49	90	260
Expense (benefit) from income taxes									19	32	92
Equity in income of subsidiaries									0	0	0
Income from continuing operations									30	58	168
Loss from discontinued operations, net of tax									(9)	(10)	(8)
Equity in loss of subsidiaries									0	0	0
Net income									$ 21	48	160
Change in unrealized loss related to available-for-sale securities										0	0
Total Comprehensive Income										$ 48	$ 160