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

12 Months Ended

Apr. 28, 2019

Apr. 29, 2018

Apr. 30, 2017

Performance Based Restricted Stock Units [Member] | Key Employees and (non-NEOs) [Member]

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

Restricted Stock Units Vested

^[1]

128,632

102,845

37,192

Weighted Average Fair Value

^[1]

$ 3,754

$ 3,342

$ 1,066

Price Per Share

^[1],[2]

$ 29.19

$ 32.50

$ 28.66

Performance Based Restricted Stock Units [Member] | Non-employee [Member]

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

Restricted Stock Units Vested

^[3]

10,364

16,000

12,000

Weighted Average Fair Value

^[3]

$ 320

$ 520

$ 344

Price Per Share

^[2],[3]

$ 30.90

$ 32.50

$ 28.66

Time Based Restricted Stock Units [Member]

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

Restricted Stock Units Vested

1,200

1,200

0

Weighted Average Fair Value

^[4]

$ 21

$ 37

$ 0

Price Per Share

^[5]

$ 17.36

$ 30.90

$ 0

[1]	NEOs and key employees.
[2]	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.
[3]	Non-employee
[4]	Dollar amounts are in thousands.
[5]	Price per share represents closing price of our common stock on the date the respective award vested.

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

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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

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