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Intangible Asset - Tradenames (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 03, 2020
Apr. 28, 2019
Apr. 29, 2018
Finite Lived Intangible Assets [Line Items]      
Beginning balance $ 7,232 $ 683 $ 683
acquisition of assets (note 3)   6,549  
Ending balance 540 7,232 $ 683
Continuing Operation [Member]      
Finite Lived Intangible Assets [Line Items]      
loss on impairment (143)    
Discontinued Operations [Member]      
Finite Lived Intangible Assets [Line Items]      
Beginning balance 6,600    
loss on impairment $ (6,549)    
Ending balance   $ 6,600