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

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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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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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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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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, 2015	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding	239,575	228,250	295,550	298,050
Weighted average exercise price	$ 13.24	$ 12.17	$ 11.84	$ 11.60
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	143,275
Weighted average exercise price	$ 10.99
Weighted average remaining contractual life	4 years
Aggregate intrinsic value	$ 690,000
Options exercisable	112,750
Weighted average exercise price	$ 10.93
Aggregate intrinsic value	$ 549,000
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	$ 14.69
Exercise price range upper limit	$ 18.14
Options outstanding	96,300
Weighted average exercise price	$ 16.59
Weighted average remaining contractual life	7 years 4 months 28 days
Aggregate intrinsic value	$ 16,000
Options exercisable	23,950
Weighted average exercise price	$ 15.13
Aggregate intrinsic value	$ 16,000