Commitments and Contingencies (Narratives) (Details) $ in Thousands	3 Months Ended
	Feb. 28, 2017 USD ($) Home	Feb. 29, 2016 USD ($)	Nov. 30, 2016 USD ($)
Loss Contingencies [Line Items]
Minimum warranty on electrical and other building systems (in years)	2 years
Maximum warranty on electrical and other building systems (in years)	5 years
Warranty for other components of a home (in years)	1 year
Payments	$ (6,112)	$ (4,021)
Adjustment to increase warranty liability	0	$ 259
Performance bonds	551,100		$ 535,700
Letters of credit outstanding	31,000		31,000
Cash deposits	38,153		42,829
Aggregate purchase price of land	$ 884,122		1,073,596
Warranty for Other Components of Home	1 year
Damages from Product Defects [Member]
Loss Contingencies [Line Items]
Minimum Number of Affected Homes for Construction Defect Claims | Home	2
Structural warranty provided by the company (in years)	10 years
Warranty Obligations [Member]
Loss Contingencies [Line Items]
Structural warranty provided by the company (in years)	10 years
Self Insurance [Member]
Loss Contingencies [Line Items]
Loss Contingency, Receivable	$ 83,200		$ 84,500