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Summary of Status of Options Granted under Stock Option Plans and Changes in Options Outstanding (Detail) (Stock Option, USD $)	6 Months Ended
	Apr. 30, 2015
Stock Option
Shares
Options Outstanding at beginning of year	1,044,932us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options granted	181,039us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options exercised	(1,337)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options canceled or expired	(8,944)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options outstanding at end of year	1,215,690us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options exercisable at end of year	777,378us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options vested and expected to vest at end of year	1,207,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Weighted Average Exercise Price
Options outstanding at beginning of year	$ 3.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options granted	$ 4.39us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options exercised	$ 3.16us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options canceled or expired	$ 3.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options outstanding at end of year	$ 3.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options exercisable at end of year	$ 2.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember
Options vested and expected to vest at end of year	$ 3.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_StockOptionMember

X

- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Subparagraph (c)(1)(iii)

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- Definition

Weighted average price of options that were either forfeited or expired.

+ References

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-Publisher FASB

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-Topic 718

-SubTopic 10

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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

-Publisher FASB

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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

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

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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- Definition

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.

+ References

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-Publisher FASB

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- Definition

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

+ References

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

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Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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