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Notes Payable (Schedule of Notes Payable) (Details) - USD ($) | Nov. 30, 2020 | Nov. 30, 2020 | Nov. 30, 2020 | Nov. 30, 2019 | Nov. 22, 2019 | Nov. 04, 2019 | Mar. 08, 2019 | Feb. 20, 2019 | Feb. 01, 2019 | Feb. 17, 2015 | Oct. 29, 2013 | Jan. 29, 2013 | Jul. 31, 2012
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable | $ 1,747,175,000 |  |  | $ 1,748,747,000 |  |  |  |  |  |  |  |  |
Convertible senior notes due February 1, 2019 at 1.375% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  |  |  |  |  |  |  |  |  |  |  | 1.375% |
Mortgages and land contracts due to land sellers and other loans (at interest rates of 7% at November 30, 2013 and 6% to 7% at November 30, 2012) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  |  |  | 7.00% |  |  |  |  |  |  |  |  |
Notes payable | 4,667,000 |  |  | $ 7,889,000 |  |  |  |  |  |  |  |  |
Mortgages and land contracts due to land sellers and other loans (at interest rates of 7% at November 30, 2013 and 6% to 7% at November 30, 2012) | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  | 4.50% |  |  |  |  |  |  |  |  |  |  |
Mortgages and land contracts due to land sellers and other loans (at interest rates of 7% at November 30, 2013 and 6% to 7% at November 30, 2012) | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  | 6.00% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Senior notes due May 15, 2019 at 4.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  |  |  |  |  |  | 4.75% |  |  |  |  |  |
Senior Notes | Senior notes due March 15, 2020 at 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  |  |  |  | 8.00% |  |  |  |  |  |  |  |
Senior Notes | Senior notes due December 15, 2021 at 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  | 7.00% |  |  |  |  |  |  |  |  |  |  |
Notes payable | 449,029,000 |  |  | 448,164,000 |  |  |  |  |  |  |  |  |
Principal |  |  |  |  |  |  |  |  |  |  | $ 450,000,000 |  |
Effective interest rate |  |  |  |  |  |  |  |  |  |  | 7.20% |  |
Senior Notes | Senior notes due September 15, 2022 at 7.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  | 7.50% |  |  |  |  |  |  |  |  |  |  |
Notes payable | 348,846,000 |  |  | 348,267,000 |  |  |  |  |  |  |  |  |
Principal |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000
Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 7.70%
Senior Notes | Senior Notes Due Two Thousand Twenty Three At Seven Point Six Two Five Percent |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  | 7.625% |  |  |  |  |  |  |  |  |  |  |
Notes payable | 351,281,000 |  |  | 351,748,000 |  |  |  |  |  |  |  |  |
Principal |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |
Effective interest rate |  |  |  |  |  |  |  |  |  | 7.50% |  |  |
Senior Notes | Senior Notes Due Two Thousand Twenty Seven At Six Point Eight Seven Five Percent |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  | 6.875% | 6.875% |  |  |  |  |  |  |  |  |  |
Notes payable | 296,757,000 |  |  | 296,379,000 |  |  |  |  |  |  |  |  |
Principal |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  | 7.10% |  |  |  |  |
Senior Notes | Senior Notes Due Two Thousand Twenty Nine At Four Point Eight Percent |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  | 4.80% | 4.80% |  |  |  |  |  |  |  |  |  |
Notes payable | $ 296,595,000 |  |  | $ 296,300,000 |  |  |  |  |  |  |  |  |
Principal |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  | 5.00% |  |  |  |  |  |  |
Senior Notes | Convertible senior notes due February 1, 2019 at 1.375% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate percentage |  |  |  |  |  |  |  |  | 1.375% |  |  |  |

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