Percentage of conversion price

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- Definition

Percentage of principal amount including accrued interest for repurchases options by the company for holders of debentures

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- Definition

The component of interest expense representing the noncash expenses charged against earnings in the period to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include Noncash Interest Expense.

+ References

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

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- Definition

The ratio applied to the debt for purposes of determining the number of shares of the equity security into which the debt will be converted.

+ References

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-Glossary Conversion Rate
-URI http://asc.fasb.org/extlink&oid=6509012

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- Definition

The earliest date on which the debt instrument can be converted into equity, which may be presented in a variety of ways (for example, (year only, month and year, day, month and year, quarter).

+ References

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- Definition

Remaining amortization period for any discount on the liability component of convertible debt which may be settled in cash upon conversion.

+ References

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-Name Accounting Standards Codification
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- Definition

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.

+ References

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-Publisher AICPA
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- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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- Definition

Interest rate stated in the contractual debt agreement.

+ References

+ Details

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- Definition

Date when the debt instrument was issued, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

+ References

+ Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4
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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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-Name FASB Staff Position (FSP)
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- Definition

Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings.

+ References

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
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Debt (Convertible Senior Debentures) (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		9 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010	Oct. 31, 2010	Jan. 31, 2011	Dec. 31, 2006
Condition for conversion, percent of conversion price per share			135.00%
Unamortized debt discount	$ 3,900,000		$ 3,900,000
Convertible Senior Debentures [Member]
Convertible senior debentures, issuance date			December 2006
Convertible senior debentures, face value	350,000,000		350,000,000			350,000,000	350,000,000
Debt, maturity date			Dec. 01, 2026
Convertible senior debentures, annual interest rate	2.75%		2.75%				2.75%
Earliest date convertible				June 15, 2026
Conversion ratio of shares at which debt will be converted into common stock			18.4310
Conversion price per share at which debt will be converted into common stock	$ 54.26		$ 54.26
Percentage of principal amount including accrued interest for repurchases options by the company for holders of debentures					100.00%
Borrowing rate of non-convertible debt					6.30%
Interest expense	2,400,000	2,400,000	4,800,000	4,800,000
Non-cash interest expense	2,500,000	2,500,000	5,000,000	5,000,000
Unamortized debt discount	3,854,000		3,854,000			8,993,000
Remaining amortization period of unamortized debt discount (in months)	5		5
Convertible Senior Debentures, Base Amount For Conversion [Member]
Convertible senior debentures, face value	$ 1,000		$ 1,000