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Investment in Unconsolidated Joint Venture - Narrative (Detail) - USD ($)
3 Months Ended 6 Months Ended
Nov. 03, 2019
Oct. 28, 2018
Nov. 03, 2019
Oct. 28, 2018
Apr. 28, 2019
Schedule of Equity Method Investments [Line Items]          
Income (loss) from investment in unconsolidated joint venture $ (16,000) $ (55,000) $ (3,000) $ (132,000)  
Investment in unconsolidated joint venture 1,504,000 1,470,000 1,504,000 1,470,000 $ 1,508,000 [1]
CLIH [Member]          
Schedule of Equity Method Investments [Line Items]          
Unconsolidated joint venture, net Income (loss)     (6,000) (263,000)  
Income (loss) from investment in unconsolidated joint venture     (3,000) (132,000)  
Investment in unconsolidated joint venture $ 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000 $ 1,500,000
[1] Derived from audited financial statements.