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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 01, 2019 | Nov. 30, 2019 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2017 | Dec. 01, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | $ 302,500 |  |  |  | $ 385,200 |  |  |  | $ 302,500 | $ 385,200 |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 4,552,747 | 4,547,002 | $ 4,368,529 |
Pretax income (loss) |  |  | 164,967 | $ 91,936 | $ 56,761 | $ 34,511 | 128,936 | $ 114,676 | $ 78,308 | $ 46,045 | 348,175 | 367,965 | 289,995 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  | (79,400) | (197,600) | (109,400) |
Net Income (Loss) Attributable to Parent |  |  | 123,167 | $ 68,136 | $ 47,461 | $ 30,011 | 96,836 | $ 87,476 | $ 57,308 | $ (71,255) | 268,775 | 170,365 | $ 180,595 |
Inventories |  |  | 3,704,602 |  |  |  | 3,582,839 |  |  |  | 3,704,602 | 3,582,839 |  |
Assets |  |  | 5,015,482 |  |  |  | 5,073,571 |  |  |  | 5,015,482 | 5,073,571 |  |
Retained earnings |  |  | 2,157,183 |  |  |  | 1,897,168 |  |  |  | 2,157,183 | 1,897,168 |  | $ 1,908,778
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  |  |  |  |  |  | 5,300 | 1,000 |  |
Contract with Customer, Liability |  |  | $ 22,382 |  |  |  | $ 19,491 |  |  |  | $ 22,382 | $ 19,491 |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,610
Earnings per share: Diluted (usd per share) |  |  | $ 1.31 | $ 0.73 | $ 0.51 | $ 0.31 | $ 0.96 | $ 0.87 | $ 0.57 | $ (0.82) | $ 2.85 | $ 1.71 | $ 1.85 |
Impairment of Real Estate |  |  |  |  |  |  |  |  |  |  | $ 14,000 | $ 26,100 | $ 20,600 |
Property and equipment, net |  |  | $ 65,043 |  |  |  | $ 24,283 |  |  |  | 65,043 | 24,283 |  |
Less accumulated depreciation | [1] |  | 60,338 |  |  |  | 20,148 |  |  |  | 60,338 | 20,148 |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  | 27,158 | 2,530 | 2,791 |
Advertising costs incurred |  |  |  |  |  |  |  |  |  |  | 43,600 | 37,300 | 34,400 |
Expensed legal fees |  |  |  |  |  |  |  |  |  |  | 16,700 | 12,400 | 14,000 |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  | 0 |  |  |  |  | 0 | 0 | (35,288)
Property and equipment, net |  |  |  |  |  |  | 0 |  |  |  |  | 0 | 0 | 31,194
Amounts without the Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pretax income (loss) |  |  |  |  |  |  |  |  |  |  | 346,191 |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  | (78,900) |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  |  | 267,291 |  |  |
Retained earnings |  |  | 2,144,090 |  |  |  |  |  |  |  | $ 2,144,090 |  |  |
Earnings per share: Diluted (usd per share) |  |  |  |  |  |  |  |  |  |  | $ 2.85 |  |  |
Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pretax income (loss) |  |  |  |  |  |  |  |  |  |  | $ 1,984 |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  | 500 |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  |  | 1,484 |  |  |
Retained earnings |  |  | 13,093 |  |  |  |  |  |  |  | $ 13,093 |  |  | 11,610
Earnings per share: Diluted (usd per share) |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Financial services |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  |  | $ (4,333) | (3,844) | (3,430) |
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  |  |  | (4,333) | (3,844) | (3,430) |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 10,756 | 9,363 | 8,834 |
Revenues |  |  |  |  |  |  |  |  |  |  | 15,089 | 13,207 | 12,264 |
Pretax income (loss) |  |  |  |  |  |  |  |  |  |  | 22,986 | 16,664 | 13,068 |
Assets |  |  | 38,396 |  |  |  | 12,380 |  |  |  | 38,396 | 12,380 |  | 32,108
Financial services | Amounts without the Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 14,211 |  |  |
Assets |  |  | 17,790 |  |  |  |  |  |  |  | 17,790 |  |  |
Financial services | Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 878 |  |  |
Assets |  |  | 20,606 |  |  |  |  |  |  |  | 20,606 |  |  | 19,728
Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  |  | (3,708,928) | (3,743,920) | (3,646,468) |
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  |  |  | (497,350) | (444,154) | (426,394) |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 331,380 | 345,721 | 283,403 |
Revenues |  |  |  |  |  |  |  |  |  |  | 4,537,658 | 4,533,795 | 4,356,265 |
Pretax income (loss) |  |  |  |  |  |  |  |  |  |  | 325,189 | 351,301 | $ 276,927 |
Inventories |  |  | 3,704,602 |  |  |  | 3,582,839 |  |  |  | 3,704,602 | 3,582,839 |  | 3,547,551
Assets |  |  | 4,977,086 |  |  |  | 5,061,191 |  |  |  | 4,977,086 | 5,061,191 |  |
Deferred tax assets, net |  |  | 364,493 |  |  |  | 441,820 |  |  |  | 364,493 | 441,820 |  | 437,796
Property and equipment, net |  |  | 65,043 |  |  |  | $ 24,283 |  |  |  | 65,043 | $ 24,283 |  | 55,477
Homebuilding: | Amounts without the Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  |  | (3,740,337) |  |  |
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  |  |  | (464,105) |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 330,274 |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 4,534,716 |  |  |
Inventories |  |  | 3,746,567 |  |  |  |  |  |  |  | 3,746,567 |  |  |
Deferred tax assets, net |  |  | 369,017 |  |  |  |  |  |  |  | 369,017 |  |  |
Property and equipment, net |  |  | 26,067 |  |  |  |  |  |  |  | 26,067 |  |  |
Homebuilding: | Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  |  | (31,409) |  |  |
Selling, General and Administrative Expense |  |  |  |  |  |  |  |  |  |  | 33,245 |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  | 1,106 |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 2,942 |  |  |
Inventories |  |  | (41,965) |  |  |  |  |  |  |  | (41,965) |  |  | (35,288)
Deferred tax assets, net |  |  | (4,524) |  |  |  |  |  |  |  | (4,524) |  |  | (4,024)
Property and equipment, net |  |  | $ 38,976 |  |  |  |  |  |  |  | $ 38,976 |  |  | $ 31,194
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Homebuilding: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  | 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 |  |  |
Forecast [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  | $ 31,000 |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease Right of Use Liability |  | 31,000 |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | $ 1,500 |  |  |  |  |  |  |  |  |  |  |  |
[1] | The balance at November 30, 2019 reflects a change in the classification of certain community sales office and other marketing- and model home-related costs and related accumulated amortization from inventories to property and equipment, net due to our adoption of ASC 606 effective December 1, 2018, as described in Note 1 – Summary of Significant Accounting Policies

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