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ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Dec. 27, 2019
Sep. 27, 2019
Dec. 28, 2018
Receivables [Abstract]      
Allowances for doubtful accounts receivable $ 3,062 $ 2,550 $ 1,327
Accounts receivable, net $ 78,249 $ 44,508 $ 55,558