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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - ASC 606 Impact of Balance Sheet (Details) - USD ($)
$ in Thousands
Nov. 30, 2019
Dec. 01, 2018
Nov. 30, 2018
Nov. 30, 2017
Assets        
Inventories $ 3,704,602   $ 3,582,839  
Property and equipment, net 65,043   24,283  
Assets 5,015,482   5,073,571  
Retained earnings 2,157,183 $ 1,908,778 1,897,168  
Homebuilding:        
Assets        
Inventories 3,704,602 3,547,551 3,582,839  
Deferred tax assets, net 364,493 437,796 441,820  
Property and equipment, net 65,043 55,477 24,283  
Assets 4,977,086   5,061,191  
Financial services        
Assets        
Assets 38,396 32,108 12,380  
Amounts without the Adoption of ASC 606        
Assets        
Retained earnings 2,144,090      
Amounts without the Adoption of ASC 606 | Homebuilding:        
Assets        
Inventories 3,746,567      
Deferred tax assets, net 369,017      
Property and equipment, net 26,067      
Amounts without the Adoption of ASC 606 | Financial services        
Assets        
Assets 17,790      
Accounting Standards Update 2014-09 [Member]        
Assets        
Inventories   (35,288) 0 $ 0
Property and equipment, net   31,194 $ 0 $ 0
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower)        
Assets        
Retained earnings 13,093 11,610    
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) | Homebuilding:        
Assets        
Inventories (41,965) (35,288)    
Deferred tax assets, net (4,524) (4,024)    
Property and equipment, net 38,976 31,194    
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) | Financial services        
Assets        
Assets $ 20,606 $ 19,728