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Stockholders' Equity - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Oct. 31, 2019 USD ($) shares	Oct. 31, 2018 USD ($)	Oct. 31, 2019 USD ($) OptionPlan shares	Oct. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive shares of common stock excluded from computation of diluted earnings per share | shares	45,441
Number of incentive stock plans | OptionPlan			2
Intrinsic value of stock outstanding | $	$ 335,000	$ 2,000,000.0	$ 335,000	$ 2,000,000.0
Intrinsic value of stock exercisable | $	335,000	2,000,000.0	335,000	2,000,000.0
Intrinsic value of stock exercised | $	100,000	$ 154,000	100,000	230,000
Unrecognized compensation expense relating to outstanding stock options | $	0		0
Stock-based compensation expense | $			$ 3,000,000.0	$ 4,000,000.0
Performance period			3 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Vesting, percentage			0.25%
Stock units, awarded | shares			252,911	191,085
Grant date fair value of vested RSUs and PSUs | $			$ 1,900,000	$ 2,200,000
Stock units, forfeited | shares			67,454	16,363
RSUs | Non-Executive Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded | shares			137,271	141,576
RSUs | Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded | shares			115,640	49,509
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, forfeited | shares			156,725	112,000
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $			$ 2,700,000	$ 3,600,000
Stock units, awarded | shares			252,911	191,085
Stock units, forfeited | shares			224,179	128,363
Unrecognized compensation expense related to unvested RSUs and PSUs | $	$ 6,200,000		$ 6,200,000
Weighted average remaining contractual term			1 year 6 months
2013 Incentive Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option, exercisable period			10 years
2013 Incentive Stock Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
2013 Incentive Stock Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years

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