Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 23, 2021	Jan. 25, 2020	Jan. 23, 2021	Jan. 25, 2020
Stock-based compensation expense recognized for outstanding grants
Equity-based awards expense	$ 2,948	$ 2,528	$ 9,115	$ 7,235
Liability-based awards expense	587	(303)	1,925	37
Total stock-based compensation expense	$ 3,535	$ 2,225	$ 11,040	$ 7,272

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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