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Fair Value Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2011	Nov. 30, 2010
Debt Instrument [Line Items]
Carrying Value	$ 1,583,571	$ 1,775,529
Senior notes due 2011 at 6 3/8% [Member]
Debt Instrument [Line Items]
Carrying Value	0	99,916
Estimated Fair Value	0	101,500
Senior notes due 2014 at 5 3/4% [Member]
Debt Instrument [Line Items]
Carrying Value	249,647	249,498
Estimated Fair Value	232,500	246,250
Senior notes due 2015 at 5 7/8% [Member]
Debt Instrument [Line Items]
Carrying Value	299,273	299,068
Estimated Fair Value	270,000	289,500
Senior notes due 2015 at 6 1/4% [Member]
Debt Instrument [Line Items]
Carrying Value	449,795	449,745
Estimated Fair Value	401,625	435,375
Senior notes due 2017 at 9.1% [Member]
Debt Instrument [Line Items]
Carrying Value	260,865	260,352
Estimated Fair Value	235,519	279,575
Senior notes due 2018 at 7 1/4% [Member]
Debt Instrument [Line Items]
Carrying Value	299,007	298,893
Estimated Fair Value	$ 251,625	$ 286,500

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.

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