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Basis of Presentation and Significant Accounting Policies (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2020 | Aug. 31, 2019 | May 31, 2020 | Dec. 01, 2019 | Nov. 30, 2019 | May 31, 2019 | Dec. 01, 2018 | Nov. 30, 2018
Increase(decrease) in Homes To Be Delivered | (14.00%) |  |  |  |  |  |  |  |  |
Equity | $ 2,565,308 | $ 2,262,229 | $ 2,565,308 | $ 2,262,229 | $ 2,490,354 |  | $ 2,383,122 | $ 2,195,210 |  | $ 2,087,500
Severance Costs |  |  | 6,700 |  |  |  |  |  |  |
Cash equivalents | 594,500 |  | 594,500 |  |  |  | 302,500 |  |  |
Other comprehensive income (loss) | 78,400 | 68,100 | 190,200 | 145,600 |  |  |  |  |  |
Retained earnings | 2,326,060 |  | 2,326,060 |  |  |  | 2,157,183 |  |  |
Financial Service [Member] |  |  |  |  |  |  |  |  |  |
Contract assets | 21,600 |  | 21,600 |  |  |  | 20,600 |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |
Equity | $ 2,326,060 | $ 2,042,034 | $ 2,326,060 | $ 2,042,034 | $ 2,255,742 |  | 2,157,183 | $ 1,981,795 |  | $ 1,897,168
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  | $ 11,610 |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  | $ 1,500 | 1,510 |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  | $ 1,600 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  | $ 11,610 |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  | 1,510 |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  | $ 1,643 |  |  |

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