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Commitments and Contingencies (Narratives) (Details)
3 Months Ended
Feb. 29, 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 $ 817,500,000 $ 793,900,000
Letters of credit outstanding $ 45,800,000 34,700,000
Warranty for other components of a home (in years) 1 year  
Cash deposits $ 75,606,000 75,186,000
Aggregate purchase price of land $ 1,392,865,000 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 $ 50,800,000 $ 50,600,000
Northern California Townhome Community [Member]    
Loss Contingencies [Line Items]    
Loss Contingency Accrual $ 25,000,000.0  
Chapter 558 of the Florida Statutes [Member]    
Loss Contingencies [Line Items]    
Outstanding noticed claims | claim_filed 480  
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