Stock-Based Compensation - Plans and Expense (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
Apr. 25, 2020	Apr. 27, 2019	Apr. 28, 2018
Stock-based compensation expense recognized for outstanding grants
Equity-based awards expense	$ 8,371	$ 10,981	$ 9,474
Liability-based awards expense	(982)	339	405
Total stock-based compensation expense	7,389	11,320	9,879
Stock options
Stock-based compensation expense recognized for outstanding grants
Equity-based awards expense	2,000	3,507	4,180
Restricted stock awards
Stock-based compensation expense recognized for outstanding grants
Equity-based awards expense	2,913	2,548	2,196
Stock appreciation rights
Stock-based compensation expense recognized for outstanding grants
Liability-based awards expense	(240)	98	252
Restricted stock units
Stock-based compensation expense recognized for outstanding grants
Equity-based awards expense	900	704	704
Liability-based awards expense	20	22	87
Performance based units
Stock-based compensation expense recognized for outstanding grants
Equity-based awards expense	2,558	4,222	2,394
Liability-based awards expense	6	7	(28)
Deferred stock units
Stock-based compensation expense recognized for outstanding grants
Liability-based awards expense	$ (768)	$ 212	$ 94
2017 Omnibus Incentive Plan
Stock-Based Compensation
Aggregate number of common shares that may be issued through awards (in shares)			5.9

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

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

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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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Number of shares authorized for issuance under share-based payment arrangement.

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