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Notes Payable (Narratives) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2016 | Aug. 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 | $ 33,100,000 |  | 33,100,000 |  | $ 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 | $ 46,000,000 |  | $ 46,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 302,700,000 |  | 302,700,000 |  |
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 | 230,900,000 |  | 230,900,000 |  |
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 | 32,485,000.000 |  | 32,485,000.000 |  |
Letters of credit outstanding | 600,000 |  | 600,000 |  | $ 9,100,000
Unsecured revolving credit facility, remaining borrowing capacity | 105,000,000 |  | $ 105,000,000 |  |
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 | $ 242,500,000 |  | $ 242,500,000 |  |
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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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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