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Stock-based compensation and equity transactions - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining life of options outstanding			4 years 10 months 2 days
Weighted average remaining contractual life of options exercisable			4 years 6 months 11 days
Weighted average life of options vested and expected to vest			4 years 10 months 6 days
Aggregate intrinsic value of options outstanding	$ 2,400,000		$ 2,400,000
Aggregate intrinsic value of options exercisable	2,300,000		2,300,000
Aggregate intrinsic value of options vested and expected to vest	2,400,000		2,400,000
Non-vested stock-based arrangements yet to be recognized	443,000		443,000
Stock based arrangements yet to be recognized, weighted average period expected to be recognized			4 years 7 months 24 days
Weighted average fair value of stock options under Black-Scholes pricing model			$ 1.99	$ 1.12
Proceeds from exercise of stock options			524,000	2,225,000
Non-employee director annual grant	30,000		30,000
Options granted for each non-employee director			7,860
Value of stock option issued			15,000
Fair value of stock option	$ 1.91		$ 1.91
Stock based compensation expense	52,000	54,000	323,000	161,000
Incentive stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive stock options			205,323
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock for exercise of stock option			185,183
Cost of Sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			48,000	38,000
Selling, General and Administrative Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			$ 275,000	$ 123,000

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Share based goods and nonemployee services transaction value of stock option issued.

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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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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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The number of shares or units of entity securities issued in the transaction in which equity securities were issued to pay for goods or nonemployee services.

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Price of a single share of a number of saleable stocks of a company.

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

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