Commitments and Contingencies (Narratives) (Details)	3 Months Ended	9 Months Ended
	Aug. 31, 2021 USD ($) claim_filed	Aug. 31, 2021 USD ($) claim_filed home	Nov. 30, 2020 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 the home (in years)		1 year
Performance bonds	$ 1,060,000,000.00	$ 1,060,000,000.00	$ 897,600,000
Letters of credit outstanding	43,600,000	$ 43,600,000	42,100,000
Warranty for other components of a home (in years)		1 year
Cash deposits	96,844,000	$ 96,844,000	54,634,000
Aggregate purchase price of land	1,651,311,000	$ 1,651,311,000	1,418,429,000
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	$ 57,100,000	$ 57,100,000	$ 60,000,000
Northern California Townhome Community [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual				$ 25,000,000
Chapter 558 of the Florida Statutes [Member]
Loss Contingencies [Line Items]
Outstanding noticed claims | claim_filed	650	650
Maximum [Member] | Northern California Townhome Community [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Loss Exposure in Excess of Accrual, Best Estimate	$ 3,000,000
Minimum [Member] | Northern California Townhome Community [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Loss Exposure in Excess of Accrual, Best Estimate	$ 0