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Intangibles, net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 30, 2021
Jan. 25, 2020
Jan. 30, 2021
Jan. 25, 2020
Apr. 30, 2020
Intangibles, net          
Amortization expense $ 662 $ 775 $ 2,086 $ 2,102  
Weighted average          
Intangibles, net          
Weighted average amortization period     4 years   4 years