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Fair Value Disclosures (Fair Value Hierarchy, Carrying Values, and Estimated Fair Values of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 29, 2013 Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] [Member]	Feb. 28, 2014 Carrying Value Level 2	Nov. 30, 2013 Carrying Value Level 2	Feb. 28, 2014 Carrying Value Level 2 Senior Notes [Member]	Nov. 30, 2013 Carrying Value Level 2 Senior Notes [Member]	Feb. 28, 2014 Estimate of Fair Value, Fair Value Disclosure [Member] Level 2	Nov. 30, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Level 2	Feb. 28, 2014 Estimate of Fair Value, Fair Value Disclosure [Member] Level 2 Senior Notes [Member]	Nov. 30, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Level 2 Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value				$ 1,907,220	$ 1,906,883			$ 2,121,250	$ 2,069,325
Convertible Debt, Fair Value Disclosures		$ 230,000	$ 230,000			$ 249,263	$ 224,825
Debt Instrument, Interest Rate, Stated Percentage	1.375%

X

- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Convertible Security

-URI http://asc.fasb.org/extlink&oid=6509036

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Fair value portion of notes payable.

+ 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 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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