Supplemental Guarantor Information - Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 30,288	$ 95,909	$ 163,025
Cash flows from investing activities:
Capital expenditures	(17,020)	(12,440)	(12,219)
Proceeds from sale of fixed assets	370	297	2,624
Acquisition, net of cash acquired	(57,253)	0	0
Investments in unconsolidated entities	(421)	(3,261)	(4,241)
Return of capital from unconsolidated entities and marketable securities	176	1,621	1,142
Advances to/from subsidiaries	0	0	0
Net cash used in investing activities	(74,148)	(13,783)	(12,694)
Cash flows from financing activities:
Repayment of debt	(497,915)	(265,483)	(828,221)
Proceeds from issuance of new debt	400,000	250,000	642,150
Repayment of borrowings from credit facility	(225,000)	(25,000)	(90,000)
Borrowings from credit facility	225,000	25,000	90,000
Debt issuance costs	(6,272)	(4,919)	(11,246)
Other changes	(3,314)	(391)	(222)
Advances to/from subsidiaries	0	0	0
Net cash used in financing activities	(107,501)	(20,793)	(197,539)
(Decrease) increase in cash, cash equivalents, and restricted cash	(151,361)	61,333	(47,208)
Cash, cash equivalents, and restricted cash at end of period	153,248	304,609	243,276
Cash, cash equivalents, and restricted cash at beginning 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	0
Acquisition, net of cash acquired	0
Investments in unconsolidated entities	0	0	0
Return of capital from unconsolidated entities and marketable securities	0	0	0
Advances to/from subsidiaries	56,179	(148,120)	(203,701)
Net cash used in investing activities	56,179	(148,120)	(203,701)
Cash flows from financing activities:
Repayment of debt	0	0	0
Proceeds from issuance of new debt	0	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
Advances to/from subsidiaries	(49,018)	145,459	202,393
Net cash used in financing activities	(49,018)	145,459	202,393
(Decrease) increase in cash, cash equivalents, and restricted cash	7,161	(2,661)	(1,308)
Cash, cash equivalents, and restricted cash at end of period	0	(7,161)	(4,500)
Cash, cash equivalents, and restricted cash at beginning 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	(25,713)	(74,046)	(56,218)
Cash flows from investing activities:
Capital expenditures	0	0	0
Proceeds from sale of fixed assets	0	0	0
Acquisition, net of cash acquired	0
Investments in unconsolidated entities	0	0	0
Return of capital from unconsolidated entities and marketable securities	0	0	0
Advances to/from subsidiaries	(56,182)	148,081	203,690
Net cash used in investing activities	(56,182)	148,081	203,690
Cash flows from financing activities:
Repayment of debt	(497,915)	(253,046)	(819,044)
Proceeds from issuance of new debt	400,000	250,000	642,150
Repayment of borrowings from credit facility	(225,000)	(25,000)	(90,000)
Borrowings from credit facility	225,000	25,000	90,000
Debt issuance costs	(6,272)	(4,919)	(11,246)
Other changes	(3,314)	(391)	(222)
Advances to/from subsidiaries	0	0	0
Net cash used in financing activities	(107,501)	(8,356)	(188,362)
(Decrease) increase in cash, cash equivalents, and restricted cash	(189,396)	65,679	(40,890)
Cash, cash equivalents, and restricted cash at end of period	104,795	294,191	228,512
Cash, cash equivalents, and restricted cash at beginning of period	294,191	228,512	269,402
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	56,153	170,129	219,401
Cash flows from investing activities:
Capital expenditures	(17,020)	(12,440)	(12,219)
Proceeds from sale of fixed assets	370	297	2,624
Acquisition, net of cash acquired	(57,253)
Investments in unconsolidated entities	(421)	(3,261)	(4,241)
Return of capital from unconsolidated entities and marketable securities	176	1,621	1,142
Advances to/from subsidiaries	0	0	0
Net cash used in investing activities	(74,148)	(13,783)	(12,694)
Cash flows from financing activities:
Repayment of debt	0	(12,437)	(9,177)
Proceeds from issuance of new debt	0	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
Advances to/from subsidiaries	49,018	(145,459)	(202,393)
Net cash used in financing activities	49,018	(157,896)	(211,570)
(Decrease) increase in cash, cash equivalents, and restricted cash	31,023	(1,550)	(4,863)
Cash, cash equivalents, and restricted cash at end of period	47,878	16,855	18,405
Cash, cash equivalents, and restricted cash at beginning 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	(152)	(174)	(158)
Cash flows from investing activities:
Capital expenditures	0	0	0
Proceeds from sale of fixed assets	0	0	0
Acquisition, net of cash acquired	0
Investments in unconsolidated entities	0	0	0
Return of capital from unconsolidated entities and marketable securities	0	0	0
Advances to/from subsidiaries	3	39	11
Net cash used in investing activities	3	39	11
Cash flows from financing activities:
Repayment of debt	0	0	0
Proceeds from issuance of new debt	0	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
Advances to/from subsidiaries	0		0
Net cash used in financing activities	0	0	0
(Decrease) increase in cash, cash equivalents, and restricted cash	(149)	(135)	(147)
Cash, cash equivalents, and restricted cash at end of period	575	724	859
Cash, cash equivalents, and restricted cash at beginning of period	$ 724	$ 859	$ 1,006