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Investment in Unconsolidated Joint Venture - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017	Apr. 29, 2018
Schedule of Equity Method Investments [Line Items]
Loss from investment in unconsolidated joint venture	$ (55)	$ (75)	$ (132)	$ (193)
Investment in unconsolidated joint venture	$ 1,470	1,522	$ 1,470	1,522	$ 1,501	[1]
CLIH [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%
Unconsolidated joint venture, net loss			$ (263)	(386)
Loss from investment in unconsolidated joint venture			(132)	(193)
Investment in unconsolidated joint venture	$ 1,500	$ 1,500	$ 1,500	$ 1,500	$ 1,500
[1] Derived from audited financial statements.

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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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