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Stockholders' Equity - Summary of Activity for Unvested RSUs and PSUs (Detail) - RSUs and PSUs - $ / shares	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Summary of activity in unvested restricted stock units and performance share units
RSUs and PSUs outstanding, beginning of period	1,313,974	1,631,631	1,442,317
RSUs and PSUs, Awarded	270,315	578,300	541,785
RSUs and PSUs, Vested	(407,545)	(296,139)	(206,572)
RSUs and PSUs, Forfeited	(180,865)	(599,818)	(145,899)
RSUs and PSUs outstanding, end of period	995,879	1,313,974	1,631,631
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value, RSUs and PSUs outstanding, beginning of period	$ 10.86	$ 15.44	$ 17.80
Weighted Average Grant Date Fair Value, Awarded	16.54	5.75	10.65
Weighted Average Grant Date Fair Value, Vested	14.57	17.05	19.11
Weighted Average Grant Date Fair Value, Forfeited	15.18	15.34	16.11
Weighted Average Grant Date Fair Value, RSUs and PSUs outstanding, end of period	$ 11.14	$ 10.86	$ 15.44

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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