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Stock-Based Compensation - Summary of Grants of Performance-Based Restricted Stock Units Associated with Senior Executives and Key Employees (Detail) - Performance-Based Restricted Stock Units [Member] - $ / shares |  |  | 9 Months Ended
--- | --- | --- | ---
Jul. 18, 2019 | Aug. 02, 2018 | Jan. 31, 2021
Senior Executives [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance-Based Restricted Stock Units Awarded |  | 93,653 | [1],[2] | 86,599 | [1],[2] | 0
Restricted Stock Units Expected to Vest | [2],[3] | 2,217 |  | 3,871 |  |
Price Per Share | [2] | $ 19.04 | [4] | $ 18.51 | [5] |
Vesting Period | [2] | 3 years |  | 3 years |  |
Key Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance-Based Restricted Stock Units Awarded |  | 29,227 | [1],[6] | 47,800 | [1],[6] | 0
Restricted Stock Units Expected to Vest | [3],[6] | 1,914 |  | 2,318 |  |
Price Per Share | [6],[7] | $ 18.49 |  | $ 24.35 |  |
Vesting Period | [6] | 3 years |  | 3 years |  |
[1] | Amounts represent the maximum number of common stock shares that could be earned if certain performance targets are met as defined in the related restricted stock unit agreements.
[2] | Performance-based restricted stock units awarded to senior executives.
[3] | Compensation cost is based on an assessment each reporting period to determine the probability of whether or not certain performance goals will be met as of the end of the vesting period, and in turn the number of shares that are expected to be awarded at the end vesting period. These amounts represent the number of shares that were expected to vest as of January 31, 2021.
[4] | Price per share represents the fair market value per share ($1.03 per $1, or an increase of $0.55 to the closing price of our common stock on the date of grant) determined using the Monte Carlo simulation model for the market-based total shareholder return component and the closing price of our common stock ($18.49) for the performance-based component of the performance-based restricted stock units granted to senior executives on July 18, 2019.
[5] | Price per share represents the fair market value per share ($0.76 per $1, or a reduction of $5.84 to the closing price of the common stock on the date of grant) determined using the Monte Carlo simulation model for the market-based total shareholder return component and the closing price of our common stock ($24.35) for the performance-based component of the performance-based restricted stock units granted to senior executives on August 2, 2018.
[6] | Performance-based restricted stock units awarded to key employees.
[7] | Price per share represents the closing price of our common stock on the date of grant.

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options expected to vested in period. + References No definition available. + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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