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Stock-Based Compensation - Plans and Expense (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Stock-based compensation expense recognized for outstanding grants
Equity-based awards expense	$ 9,474	$ 8,864	$ 8,292
Liability-based awards expense	405	1,687	1,355
Total stock-based compensation expense	$ 9,879	$ 10,551	$ 9,647
2017 Omnibus Incentive Plan
Stock-Based Compensation
Aggregate number of common shares that may be issued through awards (in shares)	5.9
2010 Omnibus Incentive Plan
Stock-Based Compensation
Aggregate number of common shares that may be issued through awards (in shares)	0.0
Previous Plans
Stock-Based Compensation
Aggregate number of common shares that may be issued through awards (in shares)	0.0

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- Definition

Expense (income) recognized during the period for share-based compensation awards that are settled in cash.

+ References

No definition available.

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- Definition

Expense recognized during the period for share-based compensation awards that are settled in stock.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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