Supplemental Guarantor Information - Unaudited Condensed Consolidating Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2015
ASSETS
Cash and cash equivalents	$ 168,381	$ 228,871	$ 127,209	$ 251,583
Restricted cash	12,735	14,405
Accounts receivable (net of allowance of $176 and $354, respectively)	39,816	53,226
Income tax receivable	380	292
Owned inventory	1,655,853	1,569,279
Investments in unconsolidated entities	3,850	10,470
Deferred tax assets, net	312,370	309,955
Property and equipment, net	18,658	19,138
Investments in subsidiaries	0	0
Intercompany	0	0
Other assets	9,582	7,522
Total assets	2,221,625	2,213,158
LIABILITIES AND STOCKHOLDERS’ EQUITY
Trade accounts payable	119,408	104,174
Other liabilities	119,654	134,253
Intercompany	0	0
Total debt (net of premium of $3,606 and $1,482, respectively, and debt issuance costs of $14,908 and $15,514, respectively)	1,334,623	1,331,878
Total liabilities	1,573,685	1,570,305
Stockholders’ equity	647,940	642,853
Total liabilities and stockholders’ equity	2,221,625	2,213,158
Consolidating Adjustments
ASSETS
Cash and cash equivalents	(7,368)	(4,500)	(5,293)	(3,192)
Restricted cash	0	0
Accounts receivable (net of allowance of $176 and $354, respectively)	0	0
Income tax receivable	0	0
Owned inventory	0	0
Investments in unconsolidated entities	0	0
Deferred tax assets, net	0	0
Property and equipment, net	0	0
Investments in subsidiaries	(753,894)	(701,931)
Intercompany	(751,637)	(737,340)
Other assets	0	0
Total assets	(1,512,899)	(1,443,771)
LIABILITIES AND STOCKHOLDERS’ EQUITY
Trade accounts payable	0	0
Other liabilities	0	0
Intercompany	(759,005)	(741,840)
Total debt (net of premium of $3,606 and $1,482, respectively, and debt issuance costs of $14,908 and $15,514, respectively)	0	0
Total liabilities	(759,005)	(741,840)
Stockholders’ equity	(753,894)	(701,931)
Total liabilities and stockholders’ equity	(1,512,899)	(1,443,771)
Beazer Homes USA, Inc.
ASSETS
Cash and cash equivalents	169,331	215,646	129,927	232,226
Restricted cash	11,348	12,867
Accounts receivable (net of allowance of $176 and $354, respectively)	0	0
Income tax receivable	380	292
Owned inventory	0	0
Investments in unconsolidated entities	773	773
Deferred tax assets, net	312,370	309,955
Property and equipment, net	0	0
Investments in subsidiaries	753,894	701,931
Intercompany	749,285	734,766
Other assets	667	577
Total assets	1,998,048	1,976,807
LIABILITIES AND STOCKHOLDERS’ EQUITY
Trade accounts payable	0	0
Other liabilities	27,078	11,315
Intercompany	2,352	2,574
Total debt (net of premium of $3,606 and $1,482, respectively, and debt issuance costs of $14,908 and $15,514, respectively)	1,320,678	1,320,065
Total liabilities	1,350,108	1,333,954
Stockholders’ equity	647,940	642,853
Total liabilities and stockholders’ equity	1,998,048	1,976,807
Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	5,540	16,866	1,702	21,543
Restricted cash	1,387	1,538
Accounts receivable (net of allowance of $176 and $354, respectively)	39,814	53,225
Income tax receivable	0	0
Owned inventory	1,655,853	1,569,279
Investments in unconsolidated entities	3,077	9,697
Deferred tax assets, net	0	0
Property and equipment, net	18,658	19,138
Investments in subsidiaries	0	0
Intercompany	0	0
Other assets	8,900	6,930
Total assets	1,733,229	1,676,673
LIABILITIES AND STOCKHOLDERS’ EQUITY
Trade accounts payable	119,408	104,174
Other liabilities	92,177	122,561
Intercompany	756,653	739,266
Total debt (net of premium of $3,606 and $1,482, respectively, and debt issuance costs of $14,908 and $15,514, respectively)	13,945	11,813
Total liabilities	982,183	977,814
Stockholders’ equity	751,046	698,859
Total liabilities and stockholders’ equity	1,733,229	1,676,673
Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	878	859	$ 873	$ 1,006
Restricted cash	0	0
Accounts receivable (net of allowance of $176 and $354, respectively)	2	1
Income tax receivable	0	0
Owned inventory	0	0
Investments in unconsolidated entities	0	0
Deferred tax assets, net	0	0
Property and equipment, net	0	0
Investments in subsidiaries	0	0
Intercompany	2,352	2,574
Other assets	15	15
Total assets	3,247	3,449
LIABILITIES AND STOCKHOLDERS’ EQUITY
Trade accounts payable	0	0
Other liabilities	399	377
Intercompany	0	0
Total debt (net of premium of $3,606 and $1,482, respectively, and debt issuance costs of $14,908 and $15,514, respectively)	0	0
Total liabilities	399	377
Stockholders’ equity	2,848	3,072
Total liabilities and stockholders’ equity	$ 3,247	$ 3,449