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Inventory - Narrative (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2026
USD ($)
home
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
home
community
Jun. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
home
Inventory Disclosure [Abstract]          
Number of homes under construction | home 2,532   2,532   1,800
Number of homes under construction, spec homes | home 1,403   1,403   1,078
Total, spec homes $ 513,100,000   $ 513,100,000   $ 417,400,000
Number of homes under construction, in-process spec homes | home 1,016   1,016   577
In-process spec homes $ 339,600,000   $ 339,600,000   $ 201,800,000
Number of homes under construction, finished spec homes | home 387   387   501
Finished spec homes $ 173,500,000   $ 173,500,000   $ 215,600,000
Threshold number of homes below a minimum threshold of profitability | home     10    
Total impairment charges on projects in progress 0 $ 8,642,000 $ 1,295,000 $ 8,642,000  
Number of projects in progress impaired (in community) | community     1    
Total impairment charges on land held for sale 2,342,000 1,466,000 $ 3,387,000 1,466,000  
Number of impaired land held for sale communities (in community) | community     4    
Estimated fair value less cost to sell of land held for sale assets at time of impairment 34,000,000.0   $ 34,000,000.0    
Abandonments charges $ 0 $ 231,000 $ 1,325,000 $ 759,000