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Stock-Based Compensation - Summary of Vested Performance Based Restricted Stock Units (Detail) - Performance Based Restricted Stock Units [Member] - USD ($)
$ / shares in Units, $ in Thousands

9 Months Ended

Jan. 27, 2019

Jan. 28, 2018

NEOs and Key Employees [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted Stock Units Vested

^[1]

126,232

102,845

Weighted Average Fair Value

^[1],[2]

$ 3,707

$ 3,342

Price Per Share

^[1],[3]

$ 29.37

$ 32.50

Non-employee [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted Stock Units Vested

^[4]

10,364

16,000

Weighted Average Fair Value

^[2],[4]

$ 320

$ 520

Price Per Share

^[3],[4]

$ 30.90

$ 32.50

[1]	NEOs and key employees.
[2]	Dollar amounts are in thousands.
[3]	The weighted average price per share is derived from the closing prices of our common stock on the dates the respective performance based restricted stock units vested.
[4]	Non-employee

X

- Definition

The fair value as of end of vesting period 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.

+ References

No definition available.

+ Details

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X

- Definition

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

+ 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)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ 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 (d)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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

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