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Significant Accounting Policies Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Significant Accounting Policies (Details) [Abstract]      
Number of years to complete a community 4 years    
Number of years to complete a master planned community 10 years    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment $ 145.0 $ 126.1  
Depreciation 21.0 18.7 $ 15.5
Advertising Expense $ 28.5 $ 26.1 $ 23.1
warranty period, structural integrity 10 years    
Construction defect claims, reported and resolved, period of time 10 years    
More Likely Than Not Definition Threshold 50.00%    
Number of Operating Segments 2    
Number of geographic segments 5