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, $ in Millions	9 Months Ended
	Aug. 31, 2019 USD ($) $ / homes community homes	Aug. 31, 2018 USD ($) $ / homes community homes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Valuation adjustments to inventory | $	$ 2.0	$ 29.4
Number of homes impaired | homes	110	688
Number of communities impaired | community	1	5
Average selling price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs		233,000
Discount rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs	0.20	0.20
Minimum | Average selling price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs	167,000
Minimum | Absorption rate per quarter (homes)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs	12	4
Maximum | Average selling price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs		843,000
Maximum | Absorption rate per quarter (homes)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable inputs		16
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Carrying value of homesites impaired | $	$ 6.2	$ 56.5