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Fair Value Disclosures (Fair Value Hierarchy, Carrying Values, and Estimated Fair Values of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2012 | Nov. 30, 2011
--- | --- | ---
Debt Instrument [Line Items] |  |
Carrying Amount | $ 1,727,679 | $ 1,583,571
Senior Notes due 2014 at 5 3/4% |  |
Debt Instrument [Line Items] |  |
Senior Notes, Rate (percent) | 5.75% | 5.75%
Carrying Amount | 75,898 | 249,647
Senior Notes due 2014 at 5 3/4% | Level 2 |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 75,898 | 249,647
Estimated Fair Value | 78,439 | 232,500
Senior Notes due 2015 at 5 7/8% |  |
Debt Instrument [Line Items] |  |
Senior Notes, Rate (percent) | 5.875% | 5.875%
Carrying Amount | 101,980 | 299,273
Senior Notes due 2015 at 5 7/8% | Level 2 |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 101,980 | 299,273
Estimated Fair Value | 104,599 | 270,000
Senior Notes due 2015 at 6 1/4% |  |
Debt Instrument [Line Items] |  |
Senior Notes, Rate (percent) | 6.25% | 6.25%
Carrying Amount | 236,819 | 449,795
Senior Notes due 2015 at 6 1/4% | Level 2 |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 236,819 | 449,795
Estimated Fair Value | 239,867 | 401,625
Senior Notes due 2017 at 9.10% |  |
Debt Instrument [Line Items] |  |
Senior Notes, Rate (percent) | 9.10% | 9.10%
Carrying Amount | 261,284 | 260,865
Senior Notes due 2017 at 9.10% | Level 2 |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 261,284 | 260,865
Estimated Fair Value | 290,175 | 235,519
Senior Notes due 2018 at 7 1/4% |  |
Debt Instrument [Line Items] |  |
Senior Notes, Rate (percent) | 7.25% | 7.25%
Carrying Amount | 299,098 | 299,007
Senior Notes due 2018 at 7 1/4% | Level 2 |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 299,098 | 299,007
Estimated Fair Value | 306,000 | 251,625
Senior Notes due 2020 at 8.00% |  |
Debt Instrument [Line Items] |  |
Senior Notes, Rate (percent) | 8.00% | 8.00%
Carrying Amount | 345,090 | 0
Senior Notes due 2020 at 8.00% | Level 2 |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 345,090 | 0
Estimated Fair Value | 374,500 | 0
Senior Notes due 2022 at 7.50% |  |
Debt Instrument [Line Items] |  |
Senior Notes, Rate (percent) | 7.50% | 7.50%
Carrying Amount | 350,000 | 0
Senior Notes due 2022 at 7.50% | Level 2 |  |
Debt Instrument [Line Items] |  |
Carrying Amount | 350,000 | 0
Estimated Fair Value | $ 363,125 | $ 0

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 3: 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 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents notes payable as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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