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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2016 | Dec. 01, 2018
Accounting Policies [Abstract] |  |  |  |
Cash equivalents | $ 385,200 | $ 481,100 |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | 1,000 |  |  |
Impairment of Real Estate | 26,104 | 20,605 | $ 49,580 |
Property and equipment amount | 24,283 | 19,521 |  |
Accumulated depreciation | 20,100 | 19,000 |  |
Depreciation expense | 2,530 | 2,791 | 3,637 |
Advertising costs incurred | 37,300 | 34,400 | 32,700 |
Expensed legal fees | $ 12,400 | $ 14,000 | $ 13,600 |
Minimum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Estimated useful life for depreciation of property and equipment | 2 years |  |  |
Maximum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Estimated useful life for depreciation of property and equipment | 10 years |  |  |
Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Retained earnings |  |  |  | $ 12,000

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