Supplemental Guarantor Information - Unaudited Condensed Consolidating Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
ASSETS
Cash and cash equivalents	$ 68,491		$ 139,805	$ 136,298
Restricted cash	16,293		13,443	12,167
Accounts receivable (net of allowance of $358 and $378, respectively)	20,287		24,647
Owned inventory	1,702,724		1,692,284
Investments in unconsolidated entities	3,941		4,035
Deferred tax assets, net	258,713		213,955
Property and equipment, net	28,276		20,843
Investments in subsidiaries	0		0
Intercompany	0		0
Goodwill	11,376		9,751
Other assets	10,178		9,339
Total assets	2,120,279		2,128,102
LIABILITIES AND STOCKHOLDERS’ EQUITY
Trade accounts payable	152,441		126,432
Other liabilities	117,635		126,389
Intercompany	0		0
Total debt, net	1,316,367		1,231,254
Total liabilities	1,586,443		1,484,075
Stockholders’ equity	533,836	$ 529,158	644,027	$ 582,667	$ 566,966	$ 682,440
Total liabilities and stockholders’ equity	2,120,279		2,128,102
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0		0
Restricted cash	0		0
Accounts receivable (net of allowance of $358 and $378, respectively)	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	(636,790)		(645,086)
Intercompany	(900,860)		(924,829)
Goodwill	0		0
Other assets	0		0
Total assets	(1,537,650)		(1,569,915)
LIABILITIES AND STOCKHOLDERS’ EQUITY
Trade accounts payable	0		0
Other liabilities	0		0
Intercompany	(900,860)		(924,829)
Total debt, net	0		0
Total liabilities	(900,860)		(924,829)
Stockholders’ equity	(636,790)		(645,086)
Total liabilities and stockholders’ equity	(1,537,650)		(1,569,915)
Beazer Homes USA, Inc. | Reportable Legal Entities
ASSETS
Cash and cash equivalents	61,938		93,875
Restricted cash	14,847		10,921
Accounts receivable (net of allowance of $358 and $378, respectively)	0		0
Owned inventory	0		0
Investments in unconsolidated entities	773		773
Deferred tax assets, net	258,713		213,955
Property and equipment, net	0		0
Investments in subsidiaries	636,790		645,086
Intercompany	899,170		922,525
Goodwill	0		0
Other assets	758		694
Total assets	1,872,989		1,887,829
LIABILITIES AND STOCKHOLDERS’ EQUITY
Trade accounts payable	0		0
Other liabilities	23,718		14,357
Intercompany	1,690		2,304
Total debt, net	1,313,745		1,227,141
Total liabilities	1,339,153		1,243,802
Stockholders’ equity	533,836		644,027
Total liabilities and stockholders’ equity	1,872,989		1,887,829
Guarantor Subsidiaries | Reportable Legal Entities
ASSETS
Cash and cash equivalents	6,552		45,355
Restricted cash	1,446		2,522
Accounts receivable (net of allowance of $358 and $378, respectively)	20,283		24,647
Owned inventory	1,702,724		1,692,284
Investments in unconsolidated entities	3,168		3,262
Deferred tax assets, net	0		0
Property and equipment, net	28,276		20,843
Investments in subsidiaries	0		0
Intercompany	0		0
Goodwill	11,376		9,751
Other assets	9,417		8,626
Total assets	1,783,242		1,807,290
LIABILITIES AND STOCKHOLDERS’ EQUITY
Trade accounts payable	152,441		126,432
Other liabilities	93,899		111,906
Intercompany	899,170		922,525
Total debt, net	2,622		4,113
Total liabilities	1,148,132		1,164,976
Stockholders’ equity	635,110		642,314
Total liabilities and stockholders’ equity	1,783,242		1,807,290
Non-Guarantor Subsidiaries | Reportable Legal Entities
ASSETS
Cash and cash equivalents	1		575
Restricted cash	0		0
Accounts receivable (net of allowance of $358 and $378, respectively)	4		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	1,690		2,304
Goodwill	0		0
Other assets	3		19
Total assets	1,698		2,898
LIABILITIES AND STOCKHOLDERS’ EQUITY
Trade accounts payable	0		0
Other liabilities	18		126
Intercompany	0		0
Total debt, net	0		0
Total liabilities	18		126
Stockholders’ equity	1,680		2,772
Total liabilities and stockholders’ equity	$ 1,698		$ 2,898