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Fair Value Measurement (Details 2) - USD ($)
$ in Millions
Jun. 30, 2016
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Carrying value $ 906.8 $ 1,383.8 $ 805.6 $ 661.8
Notes payable, Carrying value 3,301.3 3,811.5    
Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Carrying value 862.9 1,355.9    
Restricted cash, Carrying value 11.8 9.7    
Notes payable, Carrying value 2,797.1 3,333.6    
Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 862.9 1,355.9    
Restricted cash, Fair value [1] 11.8 9.7    
Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 0.0 0.0    
Restricted cash, Fair value [1] 0.0 0.0    
Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 0.0 0.0    
Restricted cash, Fair value [1] 0.0 0.0    
Financial Services [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage 634.5 631.0    
Cash and cash equivalents, Carrying value 43.9 27.9    
Mortgage repurchase facility 504.2 477.9    
Financial Services [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 43.9 27.9    
Mortgage repurchase facility, Fair value [1] 0.0 0.0    
Financial Services [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 0.0 0.0    
Mortgage repurchase facility, Fair value [1] 0.0 0.0    
Financial Services [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 0.0 0.0    
Mortgage repurchase facility, Fair value [1] 504.2 477.9    
Senior Notes [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Carrying value 2,785.7 3,325.5    
Senior Notes [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 0.0 0.0    
Senior Notes [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 2,904.1 3,405.9    
Senior Notes [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 0.0 0.0    
Secured Debt [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Carrying value 11.4 8.1    
Secured Debt [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 0.0 0.0    
Secured Debt [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 0.0 0.0    
Secured Debt [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 11.4 8.1    
Estimate of Fair Value Measurement [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 862.9 1,355.9    
Restricted cash, Fair value [1] 11.8 9.7    
Estimate of Fair Value Measurement [Member] | Financial Services [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value [1] 43.9 27.9    
Mortgage repurchase facility, Fair value [1] 504.2 477.9    
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 2,904.1 3,405.9    
Estimate of Fair Value Measurement [Member] | Secured Debt [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes payable, Fair value [2] 11.4 8.1    
Fair Value, Measurements, Recurring [Member] | Financial Services [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage [3] 0.0 0.0    
Fair Value, Measurements, Recurring [Member] | Financial Services [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage [3] 620.1 617.1    
Fair Value, Measurements, Recurring [Member] | Financial Services [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage [3] 14.4 13.9 $ 13.5 $ 12.0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Financial Services [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage [3] $ 634.5 $ 631.0    
[1] The fair value approximates carrying value due to its short-term nature, short maturity or floating interest rate terms, as applicable.
[2] The fair value is determined based on quoted market prices of recent transactions of the notes, which is classified as Level 2 within the fair value hierarchy.
[3] Mortgage loans held for sale are reflected at fair value. Interest income earned on mortgage loans held for sale is based on contractual interest rates and included in financial services interest and other income. Mortgage loans held for sale at June 30, 2016 and September 30, 2015 include $14.4 million and $13.9 million, respectively, of loans for which the Company elected the fair value option upon origination and which the Company did not sell into the secondary market. Mortgage loans held for sale totaling $14.9 million and $2.9 million were transferred to Level 3 during the nine months ended June 30, 2016 and 2015, respectively, due to significant unobservable inputs used in determining the fair value of the loans. The fair value of these mortgage loans held for sale is generally calculated considering the secondary market and adjusted for the value of the underlying collateral, including interest rate risk, liquidity risk and prepayment risk.