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Stockholders' Equity - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Oct. 31, 2020 USD ($) shares	Oct. 31, 2019 USD ($) shares	Oct. 31, 2020 USD ($) OptionPlan shares	Oct. 31, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive shares excluded from computation of diluted earnings per share	9,052	68,109	9,472
Number of stock incentive plans | OptionPlan			2
Intrinsic value of stock outstanding | $	$ 144,400	$ 335,000	$ 144,400	$ 335,000
Intrinsic value of stock exercisable | $	144,400	335,000	144,400	335,000
Intrinsic value of stock exercised | $	2,800,000	100,000	2,800,000	100,000
Unrecognized compensation expense relating to outstanding stock options | $	0	$ 0	0	0
Stock-based compensation expense | $			$ 2,100,000	$ 3,000,000.0
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			234,007	252,911
Grant date fair value of vested RSUs and PSUs | $			$ 6,600,000	$ 1,900,000
Stock units, forfeited				67,454
RSUs | Non-Executive Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded			159,485	137,271
RSUs | Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded			48,952
Stock units, forfeited			85,741
RSUs | Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded			25,570	115,640
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, forfeited			92,500	156,725
Performance Shares | Executive Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded			36,308
Stock units, forfeited			92,500
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $			$ 1,200,000	$ 2,700,000
Stock units, awarded			270,315	252,911
Stock units, forfeited			178,241	224,179
Unrecognized compensation expense related to unvested RSUs and PSUs | $	$ 4,000,000.0		$ 4,000,000.0
Weighted average remaining contractual term			1 year 7 months 6 days
2013 Incentive Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Stock option, exercisable period			10 years

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