Carrying Value And Estimated Current Fair Value Of Outstanding Convertible Notes Abstract.

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- Definition

Convertible Notes Payable.

+ Details

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- 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. Fair value of convertible debt at the balance sheet date.

+ 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

+ Details

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- Definition

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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

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- Definition

Interest rate stated in the contractual 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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Convertible Notes Payable (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2011	Oct. 31, 2010	Jul. 31, 2010
Carrying value and estimated current fair value of outstanding convertible notes
Carrying Value	$ 1,442,449	$ 1,442,705
Fair Value	1,396,204
Convertible Notes Payable (Textuals) [Abstract]
Interest on convertible notes	4.00%		4.00%
0.25% Convertible Senior Notes due May 1, 2013 [Member]
Carrying value and estimated current fair value of outstanding convertible notes
Carrying Value	216,210
Fair Value	209,048
Convertible Notes Payable (Textuals) [Abstract]
Interest on convertible notes	0.25%
4.0% Convertible Senior Notes due March 15, 2015 [Member]
Carrying value and estimated current fair value of outstanding convertible notes
Carrying Value	376,239
Fair Value	410,156
Convertible Notes Payable (Textuals) [Abstract]
Interest on convertible notes	4.00%
0.875% Convertible Senior Notes due June 15, 2017 [Member]
Carrying value and estimated current fair value of outstanding convertible notes
Carrying Value	500,000
Fair Value	406,875
Convertible Notes Payable (Textuals) [Abstract]
Interest on convertible notes	0.875%
3.75% Convertible Senior Notes, due October 15, 2018 [Member]
Carrying value and estimated current fair value of outstanding convertible notes
Carrying Value	350,000
Fair Value	$ 370,125
Convertible Notes Payable (Textuals) [Abstract]
Interest on convertible notes	3.75%