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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Business Information [Line Items]      
Cash and cash equivalents $ 2,540.5 $ 3,210.4  
Advertising expense 41.7 36.1 $ 41.7
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 2.9 2.9  
Variable Interest Entity, Consolidated, Notes Payable $ 64.3    
Forestar Group [Member]      
Business Information [Line Items]      
Noncontrolling Interest, Ownership Percentage by Parent 63.00%    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 37.00%    
Subsidiaries [Member]      
Business Information [Line Items]      
Cash and cash equivalents $ 64.4 55.9  
Variable Interest Entity, Not Primary Beneficiary [Member]      
Business Information [Line Items]      
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 1,500.0 870.2  
Accounts Receivable [Member]      
Business Information [Line Items]      
Cash and cash equivalents $ 494.8 $ 478.9