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Stock options - Additional Information (Detail) (USD $)	12 Months Ended
	Oct. 31, 2013	Oct. 31, 2013 2000 Stock Option Plan	Oct. 31, 2013 2010 Stock Incentive Plan	Mar. 09, 2010 2010 Stock Incentive Plan	Oct. 31, 2013 Stock Option	Oct. 31, 2012 Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining life of options outstanding	3 years 1 month 10 days
Weighted average remaining contractual life of options exercisable	2 years 8 months 1 day
Weighted average life of options vested and expected to vest	3 years 29 days
Aggregate intrinsic value of options outstanding	$ 6,900,000				$ 4,137,000	$ 397,000
Aggregate intrinsic value of options exercisable	5,400,000
Aggregate intrinsic value of options vested and expected to vest	5,400,000
Non-vested stock-based arrangements yet to be recognized	$ 208,000
Stock based arrangements yet to be recognized, weighted average period expected to be recognized	3 years 3 months 4 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		1,320,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			439,750

X

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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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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Number of additional shares authorized for issuance under an established share-based compensation plan.

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No definition available.

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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).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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