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Fair Value Disclosures (Level 4 inventory fv) (Details 3) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2020 USD ($) | Jan. 31, 2020 USD ($) | Oct. 31, 2019 USD ($) | Jul. 31, 2019 USD ($) | Apr. 30, 2019 USD ($) | Jan. 31, 2019 USD ($) | Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($) | Oct. 31, 2019 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Inventory Write-down | $ 14,214 |  |  |  | $ 19,394 |  | $ 15,245 | $ 26,956 |
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) | 80 | 65 | 71 | 69 | 64 | 49 |  |  |
Number of Communities Impaired (in ones) | 1 | 0 | 7 | 3 | 6 | 5 |  |  |
Fair Value Of Communities Net Of Impairment Charges | $ 2,754 | $ 0 | $ 18,910 | $ 5,436 | $ 36,159 | $ 37,282 | $ 2,754 | $ 36,159 | $ 18,910
Inventory Write-down | $ 300 | $ 0 | $ 6,695 | $ 1,100 | $ 17,495 | $ 5,785 |  |  |
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) |  |  | 4 |  | 4 | 3 |  |  |
Inventory Write-down |  |  | $ 5,100 |  | $ 15,000 | $ 1,500 |  |  |
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) |  |  | 2 |  | 1 | 1 |  |  |
Inventory Write-down |  |  | $ 600 |  | $ 500 | $ 1,500 |  |  |
Pacific [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 |  |  |  |  |  |
Inventory Write-down |  |  | $ 1,000 |  |  |  |  |  |

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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