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Investment in Unconsolidated Joint Venture - Narrative (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 02, 2020	Jan. 27, 2019	Feb. 02, 2020	Jan. 27, 2019	Apr. 28, 2019
Schedule of Equity Method Investments [Line Items]
Income (loss) from investment in unconsolidated joint venture	$ (56,000)	$ 23,000	$ (60,000)	$ (109,000)
Investment in unconsolidated joint venture	1,668,000	1,512,000	1,668,000	1,512,000	$ 1,508,000	[1]
CLIH [Member]
Schedule of Equity Method Investments [Line Items]
Unconsolidated joint venture, net Income (loss)			(120,000)	(218,000)
Income (loss) from investment in unconsolidated joint venture			(60,000)	(109,000)
Investment in unconsolidated joint venture	$ 1,700,000	$ 1,500,000	$ 1,700,000	$ 1,500,000	$ 1,500,000
[1] Derived from audited financial statements.

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