Supplemental Guarantor Information - Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 95,909	$ 163,025	$ (81,049)
Cash flows from investing activities:
Capital expenditures	(12,440)	(12,219)	(15,964)
Proceeds from sale of fixed assets	297	2,624	0
Investments in unconsolidated entities	(3,261)	(4,241)	(4,944)
Return of capital from unconsolidated entities and marketable securities	1,621	1,142	24,245
Advances to/from subsidiaries	0	0	0
Net cash (used in) provided by investing activities	(13,783)	(12,694)	3,337
Cash flows from financing activities:
Repayment of debt	(265,483)	(828,221)	(18,573)
Proceeds from issuance of new debt	250,000	642,150	0
Repayment of borrowings from credit facility	(25,000)	(90,000)	(75,000)
Borrowings from credit facility	25,000	90,000	75,000
Debt issuance costs	(4,919)	(11,246)	(126)
Other changes	(391)	(222)	(200)
Dividends paid			0
Advances to/from subsidiaries	0	0	0
Net cash used in financing activities	(20,793)	(197,539)	(18,899)
Increase (decrease) in cash, cash equivalents and restricted cash	61,333	(47,208)	(96,611)
Cash, cash equivalents and restricted cash at beginning of period	243,276	290,484	387,095
Cash, cash equivalents and restricted cash at end of period	304,609	243,276	290,484
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	0	0	0
Cash flows from investing activities:
Capital expenditures	0	0	0
Proceeds from sale of fixed assets	0	0
Investments in unconsolidated entities	0	0	0
Return of capital from unconsolidated entities and marketable securities	0	0	0
Advances to/from subsidiaries	(148,120)	(203,701)	(302,594)
Net cash (used in) provided by investing activities	(148,120)	(203,701)	(302,594)
Cash flows from financing activities:
Repayment of debt	0	0	0
Proceeds from issuance of new debt	0	0
Repayment of borrowings from credit facility	0	0	0
Borrowings from credit facility	0	0	0
Debt issuance costs	0	0	0
Other changes	0	0	0
Dividends paid			0
Advances to/from subsidiaries	145,459	202,393	300,876
Net cash used in financing activities	145,459	202,393	300,876
Increase (decrease) in cash, cash equivalents and restricted cash	(2,661)	(1,308)	(1,718)
Cash, cash equivalents and restricted cash at beginning of period	(4,500)	(3,192)	(1,474)
Cash, cash equivalents and restricted cash at end of period	(7,161)	(4,500)	(3,192)
Beazer Homes USA, Inc.
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(74,046)	(56,218)	(388,584)
Cash flows from investing activities:
Capital expenditures	0	0	0
Proceeds from sale of fixed assets	0	0
Investments in unconsolidated entities	0	0	0
Return of capital from unconsolidated entities and marketable securities	0	0	0
Advances to/from subsidiaries	148,081	203,690	302,569
Net cash (used in) provided by investing activities	148,081	203,690	302,569
Cash flows from financing activities:
Repayment of debt	(253,046)	(819,044)	(8,703)
Proceeds from issuance of new debt	250,000	642,150
Repayment of borrowings from credit facility	(25,000)	(90,000)	(75,000)
Borrowings from credit facility	25,000	90,000	75,000
Debt issuance costs	(4,919)	(11,246)	(126)
Other changes	(391)	(222)	(200)
Dividends paid			500
Advances to/from subsidiaries		0	21
Net cash used in financing activities	(8,356)	(188,362)	(8,508)
Increase (decrease) in cash, cash equivalents and restricted cash	65,679	(40,890)	(94,523)
Cash, cash equivalents and restricted cash at beginning of period	228,512	269,402	363,925
Cash, cash equivalents and restricted cash at end of period	294,191	228,512	269,402
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	170,129	219,401	307,668
Cash flows from investing activities:
Capital expenditures	(12,440)	(12,219)	(15,964)
Proceeds from sale of fixed assets	297	2,624
Investments in unconsolidated entities	(3,261)	(4,241)	(4,944)
Return of capital from unconsolidated entities and marketable securities	1,621	1,142	24,245
Advances to/from subsidiaries	0	0	0
Net cash (used in) provided by investing activities	(13,783)	(12,694)	3,337
Cash flows from financing activities:
Repayment of debt	(12,437)	(9,177)	(9,870)
Proceeds from issuance of new debt	0	0
Repayment of borrowings from credit facility	0	0	0
Borrowings from credit facility	0	0	0
Debt issuance costs	0	0	0
Other changes	0	0	0
Dividends paid			0
Advances to/from subsidiaries	(145,459)	(202,393)	(300,897)
Net cash used in financing activities	(157,896)	(211,570)	(310,767)
Increase (decrease) in cash, cash equivalents and restricted cash	(1,550)	(4,863)	238
Cash, cash equivalents and restricted cash at beginning of period	18,405	23,268	23,030
Cash, cash equivalents and restricted cash at end of period	16,855	18,405	23,268
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(174)	(158)	(133)
Cash flows from investing activities:
Capital expenditures	0	0	0
Proceeds from sale of fixed assets	0	0
Investments in unconsolidated entities	0	0	0
Return of capital from unconsolidated entities and marketable securities	0	0	0
Advances to/from subsidiaries	39	11	25
Net cash (used in) provided by investing activities	39	11	25
Cash flows from financing activities:
Repayment of debt	0	0	0
Proceeds from issuance of new debt	0	0
Repayment of borrowings from credit facility	0	0	0
Borrowings from credit facility	0	0	0
Debt issuance costs	0	0	0
Other changes	0	0	0
Dividends paid			(500)
Advances to/from subsidiaries		0	0
Net cash used in financing activities	0	0	(500)
Increase (decrease) in cash, cash equivalents and restricted cash	(135)	(147)	(608)
Cash, cash equivalents and restricted cash at beginning of period	859	1,006	1,614
Cash, cash equivalents and restricted cash at end of period	$ 724	$ 859	$ 1,006