Number of stock option plans.

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Percentage of stock outperform in order for target award to vest.

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Share based compensation arrangement by share based payment award award exercisable period.

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Share based compensation arrangement by share based payment award percentage of award achieved.

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Share based compensation arrangement by share based payment award performance period.

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Share based compensation percentage of potential target award granted for calculating maximum aggregate award of performance share.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Stockholders' Equity - Additional Information (Detail)	3 Months Ended	6 Months Ended		12 Months Ended
Stockholders' Equity - Additional Information (Detail)	Oct. 31, 2017 USD ($) shares	Oct. 31, 2017 USD ($) OptionPlan shares	Oct. 31, 2016 USD ($) shares	Apr. 30, 2017 USD ($) shares	Jun. 30, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authorization \| $					$ 50,000,000
Repurchase of common stock		0		2,600,000
Number of incentive stock option plans \| OptionPlan		2
Intrinsic value of stock outstanding \| $	$ 2,600,000	$ 2,600,000	$ 7,900,000
Intrinsic value of stock exercisable \| $	2,600,000	$ 2,600,000	$ 7,900,000
Stock options exercised		0	0
Unrecognized compensation cost of outstanding stock options \| $	0	$ 0
Stock-based compensation expense \| $		$ 4,200,000	$ 3,900,000
Performance period		3 years
Percentage of maximum potential aggregate award granted		200.00%
Percentage of stock outperform in order for target award to vest		5.00%
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		220,872	225,634
Stock units, forfeited			15,006
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		105,500	118,500
Share based payment award percentage of award achieved		115.20%	200.00%
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 3,800,000	$ 3,600,000
Stock units, awarded		236,876	344,134
Stock units, vested		281,263	363,702
Grant date fair value of vested RSUs and PSUs \| $		$ 5,900,000	$ 10,200,000
Stock units, forfeited		122,473	15,006
Unrecognized compensation cost related to unvested RSUs and PSUs \| $	$ 11,400,000	$ 11,400,000
Weighted average remaining contractual term		1 year 7 months 7 days
Non-Executive Employees \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		177,560	170,738
Directors \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		43,312	24,896
Executive Officer \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded			30,000
Executive Officer \| PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, vested		121,504	237,000
2013 Incentive Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of award vested exercisable		10 years
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares excluded from computation of diluted earnings per share	24,359	14,023
Shares issued under employee stock purchase plan		81,643	66,812
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authorization \| $				$ 50,000,000
Maximum \| 2013 Incentive Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period to award vested and calculate volatility rate		4 years
Minimum \| 2013 Incentive Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period to award vested and calculate volatility rate		3 years