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Fair Value Disclosures (Fair Value Hierarchy, Carrying Values, and Estimated Fair Values of Financial Instruments) (Details) (USD $)	Feb. 28, 2013 Convertible senior notes due February 1, 2019 at 1.375%	Jan. 29, 2013 Convertible senior notes due February 1, 2019 at 1.375%	Feb. 28, 2013 Carrying Value Level 2	Nov. 30, 2012 Carrying Value Level 2	Feb. 28, 2013 Estimated Fair Value Level 2	Nov. 30, 2012 Estimated Fair Value Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value			$ 1,670,845,000	$ 1,670,504,000	$ 1,873,328,000	$ 1,831,596,000
Convertible Debt, Fair Value Disclosures			230,000,000	0	234,313,000	0
Debt Instrument, Face Amount		$ 230,000,000
Debt Instrument, Interest Rate, Stated Percentage	1.375%	1.375%

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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