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Fair Value Disclosures (Level 4 Inv Impair inputs) (Details 2) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 USD ($) Homes_sold | Jan. 31, 2021 USD ($) Homes_sold | Oct. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) | Apr. 30, 2020 USD ($) | Jan. 31, 2020 USD ($) | Apr. 30, 2021 USD ($) | Apr. 30, 2020 USD ($) | Oct. 31, 2020 USD ($) numberOfCommunities
Fair value inputs, assets, quantitative information [Line Items] |  |  |  |  |  |  |  |  |
Inventory Write-down | $ 1,581 |  |  |  | $ 14,214 |  | $ 2,847 | $ 15,245 |
Land Owned for Future Communities [Member] |  |  |  |  |  |  |  |  |
Fair value inputs, assets, quantitative information [Line Items] |  |  |  |  |  |  |  |  |
Inventory Write-down | 0 |  |  |  | 2,105 |  | 1,100 | $ 2,105 |
Fair Value, Nonrecurring [Member] | Land Owned for Future Communities [Member] |  |  |  |  |  |  |  |  |
Fair value inputs, assets, quantitative information [Line Items] |  |  |  |  |  |  |  |  |
Inventory Write-down |  |  |  |  |  |  |  |  | $ 31,700
Number of Communities Impaired (in ones) | numberOfCommunities |  |  |  |  |  |  |  |  | 9
Fair Value Of Communities Net Of Impairment Charges |  |  | $ 21,800 |  |  |  |  |  | $ 21,800
Minimum [Member] | Land Owned for Future Communities [Member] |  |  |  |  |  |  |  |  |
Fair value inputs, assets, quantitative information [Line Items] |  |  |  |  |  |  |  |  |
Sales Price Per Lot |  |  |  |  |  |  |  |  | 33
Maximum [Member] | Land Owned for Future Communities [Member] |  |  |  |  |  |  |  |  |
Fair value inputs, assets, quantitative information [Line Items] |  |  |  |  |  |  |  |  |
Sales Price Per Lot |  |  |  |  |  |  |  |  | 180
Operating communities [Member] |  |  |  |  |  |  |  |  |
Fair value inputs, assets, quantitative information [Line Items] |  |  |  |  |  |  |  |  |
Inventory Write-down |  |  |  |  |  |  | $ 1,100 |  | $ 675
Operating communities [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Fair value inputs, assets, quantitative information [Line Items] |  |  |  |  |  |  |  |  |
Average selling price |  | $ 2,003 |  |  | $ 613 |  |  |  |
Sales Pace (in ones) |  | 2 |  |  | 9 |  |  |  |
Fair Value Inputs, Discount Rate |  | 14.30% |  |  | 14.30% |  |  |  |
Operating communities [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Fair value inputs, assets, quantitative information [Line Items] |  |  |  |  |  |  |  |  |
Average selling price |  | $ 2,003 |  |  | $ 789 |  |  |  |
Sales Pace (in ones) |  | 2 |  |  | 9 |  |  |  |
Fair Value Inputs, Discount Rate |  | 14.30% |  |  | 14.30% |  |  |  |

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