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Notes Payable (Narratives) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
May 31, 2016 | May 31, 2015 | May 31, 2016 | May 31, 2015 | Nov. 30, 2015
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 275,000,000 |  | $ 275,000,000 |  |
Letters of credit outstanding | $ 35,000,000 |  | 35,000,000 |  | $ 33,400,000
Proceeds from Issuance of Senior Long-term Debt |  |  | $ 0 | $ 250,000,000 |
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 | $ 40,100,000 |  | $ 40,100,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 266,400,000 |  | 266,400,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 300,000,000 |  | 300,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 630,000,000 |  | 630,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 350,000,000 |  | 350,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 1,050,000,000 |  | 1,050,000,000 |  |
Inventories pledged to collateralize mortgages and land contracts, carrying value | 144,100,000 |  | 144,100,000 |  |
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 | 31,557,000.000 |  | 31,557,000.000 |  |
Letters of credit outstanding | 3,400,000 |  | 3,400,000 |  | $ 9,100,000
Unsecured revolving credit facility, remaining borrowing capacity | 105,900,000 |  | $ 105,900,000 |  |
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 | $ 243,400,000 |  | $ 243,400,000 |  |
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 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 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] |  |  |  |  |
Senior notes, rate | 7.625% |  | 7.625% |  | 7.625%

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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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