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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Significant customer concentrations as a percentage of net revenue) (Details) - Accounts Receivable [Member] - Customer Concentration Risk [Member]
6 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Xinye(HK) Electronics.Co [Member]    
Concentration Risk [Line Items]    
Customer concentrations risk percentage [1] 10.60%  
Micron Technology, Inc    
Concentration Risk [Line Items]    
Customer concentrations risk percentage   15.30%
[1] Distributor of the Company's products.