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Real Estate Inventories - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Decrease in real estate inventories $ (3,216,059) $ (3,056,236) $ (3,105,553)
Real estate inventories owned 3,144,150   $ 3,078,550
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Decrease in real estate inventories 42,173 $ 49,317  
Dallas-based homebuilder [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Cash payment to acquire homebuilder 61,500    
Real estate inventories owned 63,200    
Other assets 5,500    
Accounts payable and other accrued liabilities $ 7,200