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Owned Inventory - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) contract community	Sep. 30, 2021 USD ($) home	Sep. 30, 2020 USD ($) home	Sep. 30, 2019 USD ($) community
Segment Reporting Information [Line Items]
Number of homes under construction | home		2,912	2,562
Number of homes under construction, spec homes | home		576	649
Total, spec homes		$ 116,400	$ 135,700
Number of homes under construction, in-process spec homes | home		542	516
In-process spec homes		$ 105,200	$ 93,500
Number of homes under construction, finished spec homes | home		34	133
Finished spec homes		$ 11,200	$ 42,200
Threshold number of homes below a minimum threshold of profitability | home		10
Impairment Charge	$ 109,000	$ 900	1,700	$ 131,700
Number of impaired communities in projects in progress | contract	9
Number of impaired communities, classified as land held for development | contract	6
Number of impaired communities in projects in progress | contract	9
Land held for sale	$ 38,600	0	1,300	38,600
Abandonments		853	1,646	$ 0
Continuing Operations
Segment Reporting Information [Line Items]
Number of communities impaired | community				10
Impairment Charge				$ 110,030
Land held for sale		0	1,257	38,588
California
Segment Reporting Information [Line Items]
Number of communities impaired | contract	15
Impairment Charge	$ 147,600
West
Segment Reporting Information [Line Items]
Number of impaired communities, classified as land held for sale | community	6
West | Continuing Operations
Segment Reporting Information [Line Items]
Land held for sale		0	89	37,963
West | Operating Segments
Segment Reporting Information [Line Items]
Abandonments		0	923	$ 0
West | Operating Segments | Continuing Operations
Segment Reporting Information [Line Items]
Number of communities impaired | community				9
Impairment Charge				$ 92,912
East | Operating Segments
Segment Reporting Information [Line Items]
Abandonments		465	82	0
Southeast | Continuing Operations
Segment Reporting Information [Line Items]
Land held for sale		0	8	0
Southeast | Operating Segments
Segment Reporting Information [Line Items]
Abandonments		$ 388	$ 641	$ 0
Southeast | Operating Segments | Continuing Operations
Segment Reporting Information [Line Items]
Number of communities impaired | community				1
Impairment Charge				$ 858

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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