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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, 2020 USD ($) | Apr. 30, 2020 USD ($) | Jan. 31, 2020 USD ($) | Oct. 31, 2019 USD ($) | Jul. 31, 2019 USD ($) | Apr. 30, 2019 USD ($) | Jan. 31, 2019 USD ($) | Jul. 31, 2020 USD ($) | Jul. 31, 2019 USD ($) | Oct. 31, 2019 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory Write-down | $ 6,690 |  |  |  | $ 4,679 |  |  | $ 21,934 | $ 31,636 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues | $ 78,897 |  |  |  | $ 179,608 |  |  | 291,179 | 511,226 |
Operating communities [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory Write-down |  |  |  |  |  |  |  | 300 |  | $ 31,075
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) | 66 | 80 | 65 | 71 | 69 | 64 | 49 |  |  |
Number of Communities Impaired (in ones) | 0 | 1 | 0 | 7 | 3 | 6 | 5 |  |  |
Fair Value Of Communities Net Of Impairment Charges | $ 0 | $ 2,754 | $ 0 | $ 18,910 | $ 5,436 | $ 36,159 | $ 37,282 | 0 | 5,436 | $ 18,910
Inventory Write-down | 0 | $ 300 | $ 0 | $ 6,695 | 1,100 | $ 17,495 | $ 5,785 |  |  |
City Living [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory Write-down |  |  |  |  | 0 |  |  |  | 4,800 |
North [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory Write-down | 1,106 |  |  |  | 212 |  |  | 1,478 | 17,860 |
South [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory Write-down | 630 |  |  |  | 3,072 |  |  | 2,619 | 7,418 |
Mid-Atlantic [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory Write-down | 4,783 |  |  |  | 1,277 |  |  | 15,449 | 1,380 |
Pacific [Member] |  |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Inventory Write-down | $ 4 |  |  |  | $ 31 |  |  | $ 1,961 | $ 76 |

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