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Contingencies - Warranty (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended 24 Months Ended
Jun. 30, 2016
USD ($)
home
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
home
Community
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Community
Jun. 30, 2016
USD ($)
home
Loss Contingencies [Line Items]              
Standard product warranty length, minimum     1 year        
Standard product warranty length, maximum     2 years        
Limited product warranty length     5 years        
Movement in Standard Product Warranty Accrual [Roll Forward]              
Balance at beginning of period $ 40,903 $ 28,794 $ 27,681 $ 16,084 $ 16,084    
Accruals for warranties issued 3,567 2,935 9,269 6,090      
Changes in liability related to warranties existing in prior periods 11,148 7,058 41,801 27,813      
Payments made (15,028) (7,963) (38,161) (19,163)      
Balance at end of period 40,590 30,824 40,590 30,824 27,681 $ 16,084 $ 40,590
Insurance recoveries 11,700 7,300 47,900 13,000     66,800
Insurance receivable net 30,100   30,100       30,100
Excess insurance recovery     3,600        
Insurance Settlement              
Movement in Standard Product Warranty Accrual [Roll Forward]              
Insurance recoveries 15,500            
Proceeds from insurance settlement 7,000            
Change in insurance settlements receivable 8,500            
Specific Warranty Issue              
Movement in Standard Product Warranty Accrual [Roll Forward]              
Product warranty expense             71,500
Specific Warranty Issue | Florida              
Movement in Standard Product Warranty Accrual [Roll Forward]              
Balance at beginning of period     14,500        
Balance at end of period 26,300   26,300   14,500   26,300
Product warranty expense $ 11,000 $ 6,100 $ 39,600 $ 24,000 $ 26,300 4,300 $ 70,200
Homes likely to require more than minor repairs | home 724   724       724
Movement on number of homes likely to be repaired | home     192        
Homes have been repaired | home 352   352       352
Product warranty accrual, payments $ 11,000   $ 27,800        
Estimated remaining warranty costs 6,000   6,000       $ 6,000
Specific Warranty Issue | NEW JERSEY              
Movement in Standard Product Warranty Accrual [Roll Forward]              
Product warranty expense $ (500)   $ 700     $ 600 $ 1,300
Number of communities with water intrusion issues | Community     2     1