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Investment in Unconsolidated Joint Venture - Narrative (Detail) - USD ($)	3 Months Ended
	Jul. 29, 2018	Jul. 30, 2017	Apr. 29, 2018
Schedule of Equity Method Investments [Line Items]
Loss from investment in unconsolidated joint venture	$ (77,000)	$ (118,000)
Investment in unconsolidated joint venture	$ 1,525,000	1,477,000	$ 1,501,000	[1]
CLIH [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%
Unconsolidated joint venture, net loss	$ (154,000)	(236,000)
Loss from investment in unconsolidated joint venture	(77,000)	(118,000)
Investment in unconsolidated joint venture	$ 1,525,000	$ 1,477,000	$ 1,501,000
[1] Derived from audited financial statements.

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