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Other Income (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2017 | Apr. 30, 2016 | Jul. 31, 2015 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Income from Ancillary Businesses |  |  |  | $ 16,276 | $ 17,473 | $ 23,530
Land Sales |  |  |  | 284,928 | 85,268 | 183,870
Rental Property Joint Venture Princeton Junction [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Deferred gain on land sale to joint venture |  |  |  | (2,996) |  |
Home Building Joint Venture Metro New York Five [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Land Sales |  |  |  | $ 257,800 |  |
Home Building Joint Venture Metro New York Three [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Land Sales |  |  |  |  |  | 78,500
Equity Method Investment, Ownership Percentage | 25.00% |  |  | 25.00% |  |
Deferred gain on land sale to joint venture |  |  | $ (9,300) |  |  | (9,260)
Rental Property Joint Ventures Metro Washington, D.C. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Land Sales |  |  |  |  | 38,100 |
Deferred gain on land sale to joint venture |  |  |  | $ (2,999) | (2,999) |
Home Building Joint Venture Metro New York Four [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  |  | 20.00% |  |
Security Monitoring Business [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Income from Ancillary Businesses |  |  |  |  | $ 1,600 | $ 8,100
Co-venturer [Member] | Rental Property Joint Venture Princeton Junction [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Land Sales | $ 10,200 |  |  |  |  |
Equity Method Investment, Ownership Percentage | 75.00% |  |  | 75.00% |  |
Co-venturer [Member] | Rental Property Joint Ventures Metro Washington, D.C. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Land Sales |  | $ 20,200 |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 50.00% |
Minimum [Member] | Home Building Joint Venture Metro New York Four [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  |  | 20.00% |  |

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- Definition Represents the excess (deficiency) of revenue from the reporting entity's non-core ancillary businesses over the cost incurred, which is recognized in other nonoperating income. + References No definition available. + Details
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