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Reportable Segments, Geographic Information and Major Customers - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 USD ($) segment | Oct. 01, 2016 USD ($)
Segment Reporting [Abstract] |  |
Other long-term assets and deferred income tax assets | $ | $ 44.1 | $ 41.2
Number of reportable segments | segment | 3 |
Customer Concentration Risk | Arris | Accounts Receivable |  |
Concentration Risk [Line Items] |  |
Percentage of concentration risk | 11.60% |
Customer Concentration Risk | Micron | Accounts Receivable |  |
Concentration Risk [Line Items] |  |
Percentage of concentration risk |  | 18.90%

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