Commitments and Contingencies (Narratives) (Details)	3 Months Ended	6 Months Ended
	May 31, 2020 USD ($) claim_filed	May 31, 2020 USD ($) claim_filed Home	Nov. 30, 2019 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 the home (in years)		1 year
Performance bonds	$ 789,600,000	$ 789,600,000	$ 793,900,000
Letters of credit outstanding	45,900,000	$ 45,900,000	34,700,000
Warranty for other components of a home (in years)		1 year
Cash deposits	59,239,000	$ 59,239,000	75,186,000
Aggregate purchase price of land	1,265,068,000	$ 1,265,068,000	1,423,519,000
Damages from Product Defects [Member]
Loss Contingencies [Line Items]
Structural warranty provided by the company (in years)		10 years
Minimum number of affected homes for construction defect claims | Home		2
Warranty Obligations [Member]
Loss Contingencies [Line Items]
Structural warranty provided by the company (in years)		10 years
Self Insurance [Member]
Loss Contingencies [Line Items]
Recoveries related to warranty and other claims	47,900,000	$ 47,900,000	$ 50,600,000
Northern California Townhome Community [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 25,000,000.0	$ 25,000,000.0
Chapter 558 of the Florida Statutes [Member]
Loss Contingencies [Line Items]
Outstanding noticed claims | claim_filed	503	503
Maximum [Member] | Northern California Townhome Community [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Loss Exposure in Excess of Accrual, Best Estimate	$ 8,000,000.0
Minimum [Member] | Northern California Townhome Community [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Loss Exposure in Excess of Accrual, Best Estimate	$ 0