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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, 2019	Apr. 30, 2018	Apr. 30, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	104,350	137,250	180,350
Weighted average exercise price (in dollar per shares)	$ 18.28	$ 18.01	$ 17.29
Exercise Price Range Range One
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range lower limit (in dollar per shares)	8.59
Exercise price range upper limit (in dollar per shares)	$ 11.78
Options outstanding (in shares)	7,450
Weighted average exercise price (in dollar per shares)	$ 10.76
Weighted average remaining contractual life	2 years 7 months 17 days
Aggregate intrinsic value	$ 88,000
Options exercisable (in shares)	7,450
Weighted average exercise price (in dollar per shares)	$ 10.76
Aggregate intrinsic value	$ 88,000
Exercise Price Range Range Two
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range lower limit (in dollar per shares)	$ 15.85
Exercise price range upper limit (in dollar per shares)	$ 23.62
Options outstanding (in shares)	96,900
Weighted average exercise price (in dollar per shares)	$ 18.86
Weighted average remaining contractual life	5 years 8 months 4 days
Aggregate intrinsic value	$ 392,000
Options exercisable (in shares)	77,100
Weighted average exercise price (in dollar per shares)	$ 18.29
Aggregate intrinsic value	$ 350,000

X

- Definition

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

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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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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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