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Revenue - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 26, 2020 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Estimated remaining performance obligation | $ 635.6 |
Revenue recognized that was included in contract liability at prior year end | $ 158.9 |
Accumulated Deficit | ASU No. 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Accounting standard transition adjustment |  | $ 6.4
Accounting standard transition adjustment tax effect |  | $ (2.4)

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