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Investment in Unconsolidated Joint Venture - Narrative (Detail) - USD ($)
3 Months Ended 6 Months Ended
Oct. 29, 2017
Oct. 29, 2017
Apr. 30, 2017
Jan. 01, 2017
Schedule of Equity Method Investments [Line Items]        
Loss from investment in unconsolidated joint venture $ (75,000) $ (193,000)    
Investment in unconsolidated joint venture $ 1,522,000 $ 1,522,000 $ 1,106,000 [1]  
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   $ (386,000)    
Loss from investment in unconsolidated joint venture   (193,000)    
Investment in unconsolidated joint venture $ 1,500,000 $ 1,500,000 $ 1,100,000  
[1] Derived from audited financial statements.