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Fair Value Disclosures (Level 4 Inv Impair inputs) (Details 2) - Operating communities [Member] $ in Thousands | 3 Months Ended
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Apr. 30, 2018 USD ($) Homes_sold | Jan. 31, 2018 USD ($) Homes_sold | Oct. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Jan. 31, 2017 USD ($)
Minimum [Member] |  |  |  |  |  |
Fair value inputs, assets, quantitative information [Line Items] |  |  |  |  |  |
Average selling price | $ 485 | $ 381 | $ 467 | $ 465 | $ 827 | $ 692
Sales Pace (in ones) | 10 | 7 | 12 | 3 | 6 | 4
Fair Value Inputs, Discount Rate | 16.90% | 13.80% | 16.40% | 16.50% | 16.30% | 16.30%
Maximum [Member] |  |  |  |  |  |
Fair value inputs, assets, quantitative information [Line Items] |  |  |  |  |  |
Average selling price | $ 522 | $ 1,029 | $ 540 | $ 754 | $ 856 | $ 880
Sales Pace (in ones) | 16 | 10 | 30 | 10 | 11 | 12
Fair Value Inputs, Discount Rate | 16.90% | 19.00% | 16.40% | 19.50% | 16.30% | 16.30%

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- Definition The asumed number of homes to be sold per year. + References No definition available. + Details
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- Definition Selling price of homes sold during period (home closing revenues divided by number of home closings) + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Details
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