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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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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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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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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- Definition

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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- 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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-Name Accounting Standards Codification

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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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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No definition available.

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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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No definition available.

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- Definition

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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No definition available.

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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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No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-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.

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

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-Paragraph 2

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Share Based Compensation Arrangement By Share Based Payment Award Weighted Average Fair Value Of Options Granted At Market Value Of Underlying Stock

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Earnings per Share and Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended			6 Months Ended			1 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2013	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010	Apr. 30, 2013 Performance Options [Member]	Apr. 30, 2013 Performance Restricted Stock Units [Member]	Apr. 30, 2012 Performance Restricted Stock Units [Member]	Jun. 30, 2011 Restricted Stock [Member]	Apr. 30, 2013 Restricted Stock [Member]	Oct. 31, 2012 Restricted Stock [Member]	Mar. 31, 2010 Restricted Stock [Member]	Apr. 30, 2013 Non-performance based options [Member]	Apr. 30, 2012 Non-performance based options [Member]	Oct. 31, 2012 Non-performance based options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Percentage of risk-free interest, minimum						0.40%
Percentage of risk-free interest, maximum						0.60%
Percentage of volatility, minimum						64.00%
Percentage of volatility, maximum						89.00%
Amount for dividend yield						0.00%		0.00%				0.00%
Weighted average fair value of the restricted stock units		$ 1.92	$ 1.81			$ 4.12	$ 0.00					$ 1.82		$ 1.92
Total unrecognized compensation expenses					$ 1.0	$ 14.0			$ 0.2	$ 0.5		$ 1.0		$ 2.0
Unrecognized compensation expenses expected to be recognized over weighted average period					2 years 6 months	1 year			1 year	1 year		1 year 3 months 18 days		1 year 6 months
Percentage of risk-free interest		1.10%	1.90%	2.70%				1.70%				1.30%	1.30%
Percentage of volatility		76.50%	82.40%	73.60%				82.00%				78.00%	76.00%
Period for expected life		7 years 1 month 6 days	5 years 3 months 18 days	6 years 4 months 24 days								7 years 1 month 6 days	7 years 1 month 6 days
Weighted average fair value of options granted												$ 4.61	$ 3.10
Period for stock issued vested in plan		3 years							3 years			3 years
Non-vested shares under option	2,700,000	4,422,172	7,356,508									2,748,495		4,422,172
Shares expected to vest	2,600,000	4,300,000
Shares expected to vest, weighted average exercise price	$ 3.68
Shares expected to vest, weighted average life	6 years 7 months 6 days
Shares expected to vest, aggregate intrinsic value	$ 8.4	$ 6.0
Stockholders approved shares of restricted stock											3,000,000
Shares vested under terms of related restricted stock agreement	7,304,371	7,903,327	6,042,873	4,892,680					600,000