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

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-Publisher FASB
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-Topic 718
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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No definition available.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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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 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 exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Stock Options and Share-Based Compensation - Summary of Options Outstanding, Exercisable, and Weighted Average Exercise Prices within Exercise Price Range (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	180,350	185,375	239,575	228,250
Weighted average exercise price	$ 17.29	$ 14.68	$ 13.24	$ 12.17
Exercise Price Range Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range lower limit	8.59
Exercise price range upper limit	$ 12.66
Options outstanding	34,150
Weighted average exercise price	$ 10.92
Weighted average remaining contractual life	4 years 8 months 26 days
Aggregate intrinsic value	$ 409,000
Options exercisable	34,150
Weighted average exercise price	$ 10.92
Aggregate intrinsic value	$ 409,000
Exercise Price Range Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range lower limit	$ 13.12
Exercise price range upper limit	$ 18.14
Options outstanding	101,000
Weighted average exercise price	$ 16.92
Weighted average remaining contractual life	6 years 11 months 1 day
Aggregate intrinsic value	$ 604,000
Options exercisable	44,500
Weighted average exercise price	$ 16.75
Aggregate intrinsic value	$ 274,000
Exercise Price Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range lower limit	$ 18.31
Exercise price range upper limit	$ 23.62
Options outstanding	45,200
Weighted average exercise price	$ 22.92
Weighted average remaining contractual life	9 years 3 months 22 days
Aggregate intrinsic value	$ 28,000