Financial Instruments and Fair Value Disclosures - (Unobservable Inputs Used in Discounted Cash Flow Model to Determine the Fair Value of Communities) (Details) $ / homes in Thousands	Feb. 28, 2018 $ / homes
Average selling price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs	572,000
Absorption rate per quarter (homes)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs	6
Discount rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs	0.20