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Fair Value Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified	Feb. 29, 2012	Nov. 30, 2011
Debt Instrument [Line Items]
Carrying Amount	$ 1,587,414	$ 1,583,571
Senior notes due 2014 at 5 3/4% [Member]
Debt Instrument [Line Items]
Carrying Amount	193,452	249,647
Estimated Fair Value	195,633	232,500
Senior notes due 2015 at 5 7/8% [Member]
Debt Instrument [Line Items]
Carrying Amount	169,626	299,273
Estimated Fair Value	170,007	270,000
Senior notes due 2015 at 6 1/4% [Member]
Debt Instrument [Line Items]
Carrying Amount	296,171	449,795
Estimated Fair Value	297,038	401,625
Senior notes due 2017 at 9.10% [Member]
Debt Instrument [Line Items]
Carrying Amount	261,001	260,865
Estimated Fair Value	278,250	235,519
Senior notes due 2018 at 7 1/4% [Member]
Debt Instrument [Line Items]
Carrying Amount	299,037	299,007
Estimated Fair Value	297,000	251,625
Senior notes due 2020 at 8.00% [Member]
Debt Instrument [Line Items]
Carrying Amount	344,858
Estimated Fair Value	$ 351,750

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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

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X

- 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

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