Goodwill - Summary of Change in Carrying Amount of Goodwill (Parenthetical) (Detail) - USD ($)	May 03, 2020	Apr. 28, 2019		Apr. 29, 2018	Apr. 30, 2017
Goodwill [Line Items]
Goodwill		$ 27,222,000	[1]	$ 13,569,000	$ 11,462,000
goodwill	$ 0	13,569,000
Goodwill [Member]
Goodwill [Line Items]
goodwill		13,600,000
Noncurrent Assets Held for Sale – Discontinued Operation [Member]
Goodwill [Line Items]
goodwill		$ 13,600,000

[1] At April 28, 2019, goodwill totaled $27.2 million, of which $13.6 million was classified as goodwill and $13.6 million was classified within noncurrent assets held for sale – discontinued operation, respectively, in the accompanying Consolidated Balance Sheet.