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Fair Value Disclosures (Level 4 inventory fv) (Details 3)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2019
USD ($)
Apr. 30, 2019
USD ($)
Jan. 31, 2019
USD ($)
Oct. 31, 2018
USD ($)
Jul. 31, 2018
USD ($)
Apr. 30, 2018
USD ($)
Jan. 31, 2018
USD ($)
Jul. 31, 2019
USD ($)
Jul. 31, 2018
USD ($)
Oct. 31, 2018
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Inventory Write-down $ 4,679       $ 11,061     $ 31,636 $ 28,746  
Operating communities [Member]                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Inventory Write-down               24,380   $ 30,151
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Operating communities [Member]                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Number of Operating Communities Tested (in ones) 69 64 49 43 55 65 64      
Number of Communities Impaired (in ones) 3 6 5 6 5 4 5      
Fair Value Of Communities Net Of Impairment Charges $ 5,436 $ 36,159 $ 37,282 $ 24,692 $ 43,063 $ 21,811 $ 13,318 $ 5,436 $ 43,063 $ 24,692
Inventory Write-down $ 1,100 $ 17,495 $ 5,785 $ 4,025 $ 9,065 $ 13,325 $ 3,736      
City Living [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Operating communities [Member]                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Number of Communities Impaired (in ones)   1 1              
Inventory Write-down   $ 2,000 $ 2,800              
North [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Operating communities [Member]                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Number of Communities Impaired (in ones)   2 3     1        
Inventory Write-down   $ 7,000 $ 1,500     $ 12,000        
South [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Operating communities [Member]                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Number of Communities Impaired (in ones)   1 1              
Inventory Write-down   $ 500 $ 1,500              
Mid-Atlantic [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Operating communities [Member]                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Number of Communities Impaired (in ones)   2     2          
Inventory Write-down   $ 8,000     $ 7,300