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COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Significant customer concentrations as a percentage of total accounts receivable) (Details) - Accounts Receivable [Member] - Customer Concentration Risk [Member] | 3 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018
Xinye(HK) Electronics.Co [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Customer concentrations risk percentage | [1] | 14.10% |
Forehope Electronic (Ningbo) Co Ltd [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Customer concentrations risk percentage |  | 14.00% |
Super Power International [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Customer concentrations risk percentage | [1] | 10.40% | 15.40%
Micron Technology, Inc [Member] [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Customer concentrations risk percentage |  |  | 17.70%
Haoseng Industrial Company Limited [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Customer concentrations risk percentage | [1] |  | 15.50%
[1] | Distributor of the Company's products.

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