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Fair Value Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified	May 31, 2012	Nov. 30, 2011
Carrying values and estimated fair values of financial instruments
Carrying Amount	$ 1,582,788	$ 1,583,571
Senior notes due 2014 at 5 3/4% [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	193,482	249,647
Senior notes due 2014 at 5 3/4% [Member] | Level 2 [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	193,482	249,647
Estimated Fair Value	191,033	232,500
Senior notes due 2015 at 5 7/8% [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	169,657	299,273
Senior notes due 2015 at 5 7/8% [Member] | Level 2 [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	169,657	299,273
Estimated Fair Value	163,207	270,000
Senior notes due 2015 at 6 1/4% [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	296,179	449,795
Senior notes due 2015 at 6 1/4% [Member] | Level 2 [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	296,179	449,795
Estimated Fair Value	285,556	401,625
Senior notes due 2017 at 9.10% [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	261,141	260,865
Senior notes due 2017 at 9.10% [Member] | Level 2 [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	261,141	260,865
Estimated Fair Value	267,650	235,519
Senior notes due 2018 at 7 1/4% [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	299,067	299,007
Senior notes due 2018 at 7 1/4% [Member] | Level 2 [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	299,067	299,007
Estimated Fair Value	282,000	251,625
Senior notes due 2020 at 8.00% [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	344,973
Senior notes due 2020 at 8.00% [Member] | Level 2 [Member]
Carrying values and estimated fair values of financial instruments
Carrying Amount	344,973
Estimated Fair Value	$ 339,500

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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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