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Segment Information (Concentration) (Details) | 12 Months Ended
--- | ---
Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015
Credit Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Accounts receivable from major customers percentage | 53.00% | 54.00% | 62.00%
Company A [Member] | Customer One [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue from major customers percentage | 39.00% | 40.00% | 44.00%
Company B [Member] | Customer Two [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue from major customers percentage | 12.00% | 10.00% |
Company C [Member] [Domain] | Customer Three [Member] [Domain] |  |  |
Concentration Risk [Line Items] |  |  |
Revenue from major customers percentage | 10.00% |  |

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