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Leases - Components of lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 01, 2020
Jul. 27, 2019
Components of lease costs    
Operating lease cost $ 1,190 $ 1,120
Short term lease cost 110 237
Variable lease cost 1 89
Sublease income (38) (117)
Total lease costs, net $ 1,263 $ 1,329