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Intangible Asset - Tradenames (Detail) - USD ($)
3 Months Ended 9 Months Ended
Feb. 02, 2020
Jan. 27, 2019
Feb. 02, 2020
Jan. 27, 2019
Goodwill And Intangible Assets Disclosure [Abstract]        
Beginning balance     $ 7,232,000 $ 683,000
Acquisition of business (note 3)       6,549,000
Impairment charge $ (2,400,000) $ 0 (2,428,000) 0
Ending balance $ 4,804,000 $ 7,232,000 $ 4,804,000 $ 7,232,000