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Fair Value Disclosures (Details Textual) (USD $)	3 Months Ended							12 Months Ended					12 Months Ended
	Nov. 30, 2011	Aug. 31, 2011	May 31, 2011	Feb. 28, 2011	Nov. 30, 2010	Aug. 31, 2010	Feb. 28, 2010	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2009	Aug. 15, 2011	Jul. 30, 2009	Nov. 30, 2011 Fair Value, Measurements, Nonrecurring [Member]	Nov. 30, 2010 Fair Value, Measurements, Nonrecurring [Member]	Nov. 30, 2011 Estimate of Fair Value, Fair Value Disclosure [Member]	Nov. 30, 2010 Estimate of Fair Value, Fair Value Disclosure [Member]	Nov. 30, 2011 Senior notes due 2011 at 6 3/8% [Member]	Nov. 30, 2011 Senior notes due 2014 at 5 3/4% [Member]	Jan. 28, 2004 Senior notes due 2014 at 5 3/4% [Member]	Nov. 30, 2011 Senior notes due 2015 at 5 7/8% [Member]	Dec. 15, 2004 Senior notes due 2015 at 5 7/8% [Member]	Nov. 30, 2011 Senior notes due 2015 at 6 1/4% [Member]	Jun. 02, 2005 Senior notes due 2015 at 6 1/4% [Member]	Nov. 30, 2011 Senior notes due 2017 at 9.1% [Member]	Nov. 30, 2011 Senior notes due 2018 at 7 1/4% [Member]	Apr. 03, 2006 Senior notes due 2018 at 7 1/4% [Member]
Debt Instrument [Line Items]
Senior notes, rate																	6.375%	5.75%	5.75%	5.875%	5.875%	6.25%	6.25%	9.10%	7.25%	7.25%
Additional Fair Value Disclosures (Textual)
Long-lived assets held and used													$ 34,022,000	$ 11,570,000	$ 34,000,000	$ 11,600,000
Total inventory impairments	1,300,000	300,000	20,100,000	1,000,000	1,600,000	1,400,000	6,800,000	22,730,000	9,815,000	120,848,000
Fair Value Disclosures (Textual) [Abstract]
Long-lived assets held and used, Carrying Value	56,700,000				21,400,000			56,700,000	21,400,000
Repayment of aggregate principal amount of senior notes	100,000,000							100,000,000			100,000,000	250,000,000
Senior notes	$ 350,000,000				$ 265,000,000			$ 350,000,000	$ 265,000,000										$ 250,000,000		$ 300,000,000		$ 450,000,000			$ 300,000,000

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Long lived assets held and used fair value disclosure.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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-Number 95

-Paragraph 28

-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.



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-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.



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