Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 54,808	$ 49,451
Less: Accumulated depreciation	(31,923)	(27,171)
Property and equipment, net	22,885	22,280
Model furnishings and sales office improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	19,617	17,604
Information systems
Property, Plant and Equipment [Line Items]
Property and equipment, gross	18,628	14,930
Furniture, fixtures and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,613	10,287
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,279	4,959
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,671	$ 1,671