The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The amount of net income (loss) reported by an equity method investment of the entity.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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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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No definition available.

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Investment in Unconsolidated Joint Venture - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 30, 2017	Apr. 28, 2019	Apr. 29, 2018	Apr. 30, 2017
Schedule of Equity Method Investments [Line Items]
Income (loss) from investment in unconsolidated joint venture	$ 5	$ (23)	$ 55	$ 77	$ 17	$ 56	$ 75	$ 118	$ (114)	$ (266)	$ (23)
Investment in unconsolidated joint venture	$ 1,508				1,501				$ 1,508	1,501
CLIH [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%								50.00%
Unconsolidated joint venture, net loss									$ (227)	(532)	$ (46)
Investment in unconsolidated joint venture	$ 1,500				$ 1,500				$ 1,500	$ 1,500