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Commitments and Contingencies (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]      
Letters of Credit Outstanding, Amount $ 51.1    
Special Assessment Bond 853.4    
Land purchase contract deposits 34.5 $ 23.4  
Purchase Obligation $ 870.5    
Long-Term Purchase Commitment, Period 3 years    
Operating Lease, Expense $ 4.2 $ 3.7 $ 3.1
Lessee, Operating Lease, Liability, to be Paid, Year One 4.1    
Lessee, Operating Lease, Liability, to be Paid, Year Two 3.8    
Lessee, Operating Lease, Liability, to be Paid, Year Three 3.4    
Lessee, Operating Lease, Liability, to be Paid, Year Four 2.4    
Lessee, Operating Lease, Liability, to be Paid, Year Five 1.6    
Lessee, Operating Lease, Liability, to be Paid, after Year Five $ 0.4