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Investment in Unconsolidated Joint Venture - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 27, 2019	Jan. 28, 2018	Jan. 27, 2019	Jan. 28, 2018	Apr. 29, 2018
Schedule of Equity Method Investments [Line Items]
Income (loss) from investment in unconsolidated joint venture	$ 23	$ (56)	$ (109)	$ (249)
Investment in unconsolidated joint venture	$ 1,512	1,518	$ 1,512	1,518	$ 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			$ (218)	(498)
Income (loss) from investment in unconsolidated joint venture			(109)	(249)
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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