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Notes Payable (Narratives) (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 16, 2015 | Feb. 17, 2015 | Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2015 | Aug. 31, 2014 | May. 31, 2015 | Nov. 30, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 275,000,000 |  | $ 275,000,000 |  | $ 200,000,000 |
Letters of credit outstanding |  |  | $ 26,400,000 |  | 26,400,000 |  |  | $ 26,700,000
Proceeds from Issuance of Senior Long-term Debt |  |  |  |  | $ 250,000,000 | $ 400,000,000 |  |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities |  |  | 8,402,000 | 8,402,000 | 8,402,000 | 8,402,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months |  |  | $ 15,800,000 |  | $ 15,800,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  | 25,400,000 |  | 25,400,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  | 265,000,000 |  | 265,000,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  | 300,000,000 |  | 300,000,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five |  |  | 630,000,000 |  | 630,000,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  |  | 1,400,000,000 |  | 1,400,000,000 |  |  |
Repayments of Senior Debt |  |  |  |  | 199,906,000 | $ 0 |  |
Inventories pledged to collateralize mortgages and land contracts, carrying value |  |  | 145,000,000 |  | 145,000,000 |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unsecured revolving credit facility, maximum borrowing capacity |  |  | 137,500,000 |  | 137,500,000 |  |  |
Line of Credit Facility, Amount Outstanding |  |  | 1,699,000.000 |  | 1,699,000.000 |  |  |
Letters of credit outstanding |  |  | 24,700,000 |  | 24,700,000 |  |  | $ 26,700,000
Unsecured revolving credit facility, remaining borrowing capacity |  |  | 135,800,000 |  | $ 135,800,000 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unsecured revolving credit facility, expiration date |  |  |  |  | Aug. 07, 2019 |  |  |
Unsecured revolving credit facility, maximum borrowing capacity |  |  | 450,000,000 |  | $ 450,000,000 |  |  |
Line of Credit Facility, Amount Outstanding |  |  | 0 |  | 0 |  |  |
Unsecured revolving credit facility, remaining borrowing capacity |  |  | $ 273,300,000 |  | $ 273,300,000 |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  |  | 0.30% |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  |  | 0.50% |  |  |
Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes, rate |  |  | 1.375% |  | 1.375% |  |  |
Convertible Notes Payable [Member] | Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes, rate |  |  | 1.375% |  | 1.375% |  |  | 1.375%
Debt Conversion, Converted Instrument, Shares Issued |  |  |  |  | 36.5297 |  |  |
Debt instrument, convertible, conversion price |  |  | $ 27.37 |  | $ 27.37 |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities |  |  |  |  | 8,401,831 |  |  |
Senior Notes [Member] | Senior Notes Due Two Thousand Fifteen at Six Point Two Five Percent [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes, rate |  |  |  |  |  |  |  | 6.25%
Repayments of Senior Debt | $ 199,900,000 |  |  |  |  |  |  |
Senior Notes [Member] | Senior notes due September 15, 2017 at 9.10% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes, rate |  |  | 9.10% |  | 9.10% |  |  | 9.10%
Senior Notes [Member] | Senior Notes Due Two Thousand Nineteen at Four Point Seven Five Percent [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes, rate |  |  | 4.75% |  | 4.75% |  |  | 4.75%
Senior Notes [Member] | Senior notes due March 15, 2020 at 8.00% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes, rate |  |  | 8.00% |  | 8.00% |  |  | 8.00%
Senior Notes [Member] | Senior notes due September 15, 2022 at 7.50% |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes, rate |  |  | 7.50% |  | 7.50% |  |  | 7.50%
Senior Notes [Member] | Senior Notes Due Two Thousand Twenty Three At Seven Point Six Two Five Percent [Domain] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 250,000,000 |  |  |  |  |  |
Proceeds from Issuance of Senior Long-term Debt |  | $ 247,000,000 |  |  |  |  |  |
Senior notes, rate |  |  | 7.625% |  | 7.625% |  |  |

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