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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2020 | May 31, 2020 | Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2018 | Dec. 01, 2019 | Dec. 01, 2018 | Nov. 30, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Cash equivalents |  |  | $ 508,500 | $ 302,500 |  |  |  |
Depreciation expense |  |  | 28,400 | 27,200 | $ 2,500 |  |  |
Advertising costs incurred |  |  | 29,300 | 43,600 | 37,300 |  |  |
Legal Fees |  |  | 11,600 | 16,700 | 12,400 |  |  |
Stockholder's equity |  |  | 2,665,769 | 2,383,122 | 2,087,500 |  |  | $ 1,926,311
Operating lease, right-of-use asset |  |  | 36,270 |  |  | $ 31,200 |  |
Operating lease, liability |  |  | 38,000 |  |  | $ 31,200 |  |
Reclassification of stranded tax effects |  |  | $ 1,600 |  |  |  |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  |  | us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent |  |  | us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  |  |  |  |  | us-gaap:OtherAssets |  |
Increase(decrease) in Homes To Be Delivered | 14.00% |  |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Stockholder's equity |  |  | $ 1,868,896 | 2,157,183 | 1,897,168 |  |  | $ 1,735,695
Reclassification of stranded tax effects |  |  | 1,643 |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Stockholder's equity |  |  |  |  | 11,610 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Stockholder's equity |  |  |  |  | $ 11,610 | $ 1,500 | $ 11,600 |
Employee Severance |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Severance charges |  | $ 6,700 |  |  |  |  |  |
Homebuilding: |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Operating lease, right-of-use asset |  |  | 35,967 | 0 |  |  |  |
Operating lease, liability |  |  | $ 37,668 | $ 0 |  |  |  |
Product Concentration Risk | Revenue Benchmark | Homebuilding: |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Concentration risk (in percent) |  |  | 99.60% | 99.70% |  |  |  |
Computer Hardware and Software [Member] | Minimum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Estimated useful life for depreciation of property and equipment |  |  | 2 years |  |  |  |  |
Computer Hardware and Software [Member] | Maximum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Estimated useful life for depreciation of property and equipment |  |  | 5 years |  |  |  |  |
Model Furnishings and Sales Office Improvements [Member] | Minimum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Estimated useful life for depreciation of property and equipment |  |  | 2 years |  |  |  |  |
Model Furnishings and Sales Office Improvements [Member] | Maximum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Estimated useful life for depreciation of property and equipment |  |  | 3 years |  |  |  |  |
Furniture and Fixtures [Member] | Minimum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Estimated useful life for depreciation of property and equipment |  |  | 3 years |  |  |  |  |
Furniture and Fixtures [Member] | Maximum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Estimated useful life for depreciation of property and equipment |  |  | 10 years |  |  |  |  |

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