Earnings per Share and Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
Jul. 31, 2014	Jul. 31, 2013	Oct. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Risk-free interest rate, minimum	0.60%	0.40%
Risk-free interest rate, maximum	0.70%	0.80%
Outstanding options exercisable	5,802,200
Outstanding options	7,105,202		8,829,618
Options granted	275,000
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Volatility rate, minimum	52.00%	59.00%
Volatility rate, maximum	63.00%	89.00%
Amount for dividend yield		0.00%
Weighted average fair value of the restricted stock units	$ 5.16	$ 4.19
Options granted	105,000
Unrecognized compensation expense	$ 0.7
Unrecognized compensation expense, weighted average period	1 year 6 months 21 days
Vesting period	3 years
Performance Based Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options granted	0	0
Performance Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding options exercisable	82,000
Outstanding options	640,000		688,000
Unrecognized compensation expense	0.5
Unrecognized compensation expense, weighted average period	1 year 6 months 29 days
Options granted	0
Performance Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding options exercisable	0
Outstanding options	11,944,845		11,675,782
Unrecognized compensation expense	0.9
Unrecognized compensation expense, weighted average period	5 months 12 days
Options granted	300,000
Non-Performance Based Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Risk-free interest rate	2.20%	1.60%
Volatility rate	81.00%	78.00%
Amount for dividend yield	0.00%
Expected life	6 years 8 months 1 day	7 years 1 month
Weighted average fair value of grants	$ 5.82	$ 4.77
Weighted average fair value of the restricted stock units	$ 4.28		$ 2.95
Options granted	275,000
Unrecognized compensation expense	$ 2.3
Unrecognized compensation expense, weighted average period	1 year 9 months 21 days
Vesting period	3 years

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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.

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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.

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The estimated measure of the maximum 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.

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The estimated measure of the minimum 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.

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

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

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

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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