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Inventory - Schedule of Inventory (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Real Estate [Abstract]            
Homes under construction $ 395,726us-gaap_InventoryHomesUnderConstruction   $ 282,095us-gaap_InventoryHomesUnderConstruction      
Development projects in progress 849,644us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts   786,768us-gaap_InventoryRealEstateLandAndLandDevelopmentCosts      
Land held for future development 270,518us-gaap_LandAvailableForDevelopment   301,048us-gaap_LandAvailableForDevelopment      
Land held for sale 64,929us-gaap_InventoryLandHeldForSale   51,672us-gaap_InventoryLandHeldForSale      
Capitalized interest 112,476us-gaap_RealEstateInventoryCapitalizedInterestCosts 99,868us-gaap_RealEstateInventoryCapitalizedInterestCosts 87,619us-gaap_RealEstateInventoryCapitalizedInterestCosts 72,256us-gaap_RealEstateInventoryCapitalizedInterestCosts 61,836us-gaap_RealEstateInventoryCapitalizedInterestCosts 52,562us-gaap_RealEstateInventoryCapitalizedInterestCosts
Model homes 63,743bzh_InventoryModelHomes   48,294bzh_InventoryModelHomes      
Total owned inventory $ 1,757,036us-gaap_InventoryOperativeBuilders   $ 1,557,496us-gaap_InventoryOperativeBuilders