Stock-Based Benefit Plans (Details 1) (USD $)	12 Months Ended
Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Weighted-average assumptions and the fair value used for stock option grants
Weighted-average volatility	46.99%	47.73%	49.51%
Weighted-average grant date fair value per share of options granted	$ 8.70	$ 7.94	$ 7.63
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments	$ 0	$ 0	$ 0
Employee Stock Option [Member]
Weighted-average assumptions and the fair value used for stock option grants
Weighted-average grant date fair value per share of options granted	$ 20.50	$ 19.32	$ 18.39
Minimum [Member]
Weighted-average assumptions and the fair value used for stock option grants
Expected volatility	44.20%	45.38%	46.74%
Risk-free interest rate	0.78%	1.64%	2.15%
Expected life (years)	4 years 7 months 2 days	4 years 3 months 14 days	4 years 5 months 10 days
Maximum [Member]
Weighted-average assumptions and the fair value used for stock option grants
Expected volatility	50.24%	49.46%	51.41%
Risk-free interest rate	1.77%	3.09%	3.47%
Expected life (years)	9 years 0 months 22 days	8 years 9 months	8 years 8 months 8 days

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The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Subparagraph (f)(2)(iii)

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-Name Statement of Financial Accounting Standard (FAS)

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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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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- Definition

The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

+ References

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-Publisher FASB

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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