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Investment in Unconsolidated Joint Venture - Narrative (Detail) - USD ($)
3 Months Ended
Jul. 30, 2017
Apr. 30, 2017
Jan. 01, 2017
Schedule of Equity Method Investments [Line Items]      
Loss from investment in unconsolidated joint venture $ (118,000)    
Investment in unconsolidated joint venture $ 1,477,000 $ 1,106,000 [1]  
CLIH [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 50.00%   50.00%
Unconsolidated joint venture, net loss $ (236,000)    
Loss from investment in unconsolidated joint venture (118,000)    
Investment in unconsolidated joint venture $ 1,477,000 $ 1,106,000  
[1] Derived from audited financial statements.