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Investment in Unconsolidated Joint Venture - Narrative (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Jan. 28, 2018	Jan. 28, 2018	Apr. 30, 2017		Jan. 29, 2017	Jan. 01, 2017
Schedule of Equity Method Investments [Line Items]
Loss from investment in unconsolidated joint venture	$ (56,000)	$ (249,000)
Investment in unconsolidated joint venture	$ 1,518,000	$ 1,518,000	$ 1,106,000	[1]	$ 600,000
CLIH [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%	50.00%				50.00%
Unconsolidated joint venture, net loss		$ (498,000)
Loss from investment in unconsolidated joint venture		(249,000)
Investment in unconsolidated joint venture	$ 1,500,000	$ 1,500,000	$ 1,100,000		$ 600,000
[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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The amount of net income (loss) reported by an equity method investment of the entity.

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