Financial Instruments and Fair Value Disclosures - (Unobservable Inputs Used in Discounted Cash Flow Model to Determine the Fair Value of Communities) (Details)	9 Months Ended
	Aug. 31, 2017 $ / homes
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	20.00%
Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Average selling price	125,000,000
Absorption rate per quarter (homes)	4
Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Average selling price	567,000,000
Absorption rate per quarter (homes)	10