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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

12 Months Ended

Apr. 30, 2017

May 01, 2016

Management [Member]

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

Common Stock Shares Vested

37,192

115,855

Weighted Average Fair Value

^[1]

$ 637

$ 1,183

Price Per Share

^[2]

$ 17.12

$ 10.21

Non-employee [Member]

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

Common Stock Shares Vested

12,000

Weighted Average Fair Value

^[1]

$ 345

Price Per Share

^[3]

$ 28.77

[1]	Dollar amounts are in thousands.
[2]	Price per share represents the closing price of our common stock on the date of grant.
[3]	The respective grant vested during the first quarter of fiscal 2017. Accordingly, the price per share represents the closing price of our common stock on the date the 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

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://www.xbrl.org/2003/role/presentationRef
-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=6415400&loc=d3e5070-113901

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X

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&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

No definition available.

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