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Reportable Segments, Geographic Information and Major Customers - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 04, 2020 USD ($) | Sep. 28, 2019 USD ($) | Oct. 03, 2020 USD ($) segment | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Restructuring and impairment charges | $ 6,000 | $ 1,700 | $ 6,003 | $ 1,678 | $ 0
One-time employee bonus |  |  |  |  | 13,500
Number of reportable segments | segment |  |  | 3 |  |
Other long-term assets, operating lease right-of-use assets, deferred income tax assets and intangible assets |  | 78,400 | $ 127,000 | 78,400 |
Concentration Risk [Line Items] |  |  |  |  |
Restructuring and impairment charges | $ 6,000 | $ 1,700 | $ 6,003 | $ 1,678 | $ 0
Customer Concentration Risk | General Electric Company ("GE") | Accounts Receivable |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of concentration risk |  |  | 15.70% | 10.10% |

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