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Fair Value Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified | Nov. 30, 2013 Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] | Nov. 30, 2013 Carrying Value Level 2 | Nov. 30, 2012 Carrying Value Level 2 | Nov. 30, 2013 Estimated Fair Value Level 2 | Nov. 30, 2012 Estimated Fair Value Level 2 | Jun. 30, 2004 Senior Notes [Member] Senior notes due 2011 at 6 3/8% | Nov. 30, 2013 Senior Notes [Member] Senior notes due February 1, 2014 at 5 3/4% | Nov. 30, 2012 Senior Notes [Member] Senior notes due February 1, 2014 at 5 3/4% | Jan. 28, 2004 Senior Notes [Member] Senior notes due February 1, 2014 at 5 3/4% | Nov. 30, 2013 Senior Notes [Member] Senior notes due January 15, 2015 at 5 7/8% | Nov. 30, 2012 Senior Notes [Member] Senior notes due January 15, 2015 at 5 7/8% | Dec. 15, 2004 Senior Notes [Member] Senior notes due January 15, 2015 at 5 7/8% | Nov. 30, 2013 Senior Notes [Member] Senior notes due June 15, 2015 at 6 1/4% | Nov. 30, 2012 Senior Notes [Member] Senior notes due June 15, 2015 at 6 1/4% | Jun. 02, 2005 Senior Notes [Member] Senior notes due June 15, 2015 at 6 1/4% | Nov. 30, 2013 Senior Notes [Member] Senior notes due September 15, 2017 at 9.10% | Nov. 30, 2012 Senior Notes [Member] Senior notes due September 15, 2017 at 9.10% | Jul. 30, 2009 Senior Notes [Member] Senior notes due September 15, 2017 at 9.10% | Nov. 30, 2013 Senior Notes [Member] Senior notes due June 15, 2018 at 7 1/4% | Nov. 30, 2012 Senior Notes [Member] Senior notes due June 15, 2018 at 7 1/4% | Apr. 03, 2006 Senior Notes [Member] Senior notes due June 15, 2018 at 7 1/4% | Nov. 30, 2013 Senior Notes [Member] Senior notes due March 15, 2020 at 8.00% | Nov. 30, 2012 Senior Notes [Member] Senior notes due March 15, 2020 at 8.00% | Feb. 07, 2012 Senior Notes [Member] Senior notes due March 15, 2020 at 8.00% | Nov. 30, 2013 Senior Notes [Member] Senior notes due September 15, 2022 at 7.50% | Nov. 30, 2012 Senior Notes [Member] Senior notes due September 15, 2022 at 7.50% | Jul. 31, 2012 Senior Notes [Member] Senior notes due September 15, 2022 at 7.50% | Nov. 30, 2013 Senior Notes [Member] Senior notes due December 15, 2021 at 7.00% | Oct. 29, 2013 Senior Notes [Member] Senior notes due December 15, 2021 at 7.00%
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value |  | $ 1,906,883 | $ 1,670,504 | $ 2,069,325 | $ 1,831,596 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, rate | 1.375% |  |  |  |  | 6.375% | 5.75% | 5.75% | 5.75% | 5.88% | 5.88% | 5.875% | 6.25% | 6.25% | 6.25% | 9.10% | 9.10% | 9.10% | 7.25% | 7.25% | 7.25% | 8.00% | 8.00% | 8.00% | 7.50% | 7.50% | 7.50% | 7.00% | 7.00%
Convertible Debt, Fair Value Disclosures |  | $ 230,000 | $ 0 | $ 224,825 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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