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Fair Value Measurements (Details 1) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Financial Services [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real estate owned $ 0.3 $ 0.6
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Homebuilding [Member] | Inventories [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring [1],[2] 3.8 10.1
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Homebuilding [Member] | Assets Held-for-sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring [2],[3] 0.7 2.8
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financial Services [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other mortgage loans [2],[4] 40.0 15.2
Real estate owned [2],[4] $ 0.2 $ 0.5
Inventories [Member] | Minimum [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 12.00%  
Inventories [Member] | Maximum [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 14.00%  
[1] In performing its impairment analysis of communities, discount rates ranging from 12% to 14% were used in the periods presented.
[2] The fair values included in the table above represent only those assets whose carrying values were adjusted to fair value in the respective period.
[3] The fair value of inventory available for sale was determined based on recent offers received from outside third parties, comparable sales or actual contracts.
[4] The fair values of other mortgage loans and real estate owned are determined based on the value of the underlying collateral.