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Equity Method Investment (Details) - USD ($) shares in Millions, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 21, 2019 | Aug. 01, 2019 | Sep. 28, 2019 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Purchase of equity method investment |  |  |  | $ 18.2 | $ 0.0 | $ 0.0
SuperSonic Imagine |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage (percent) |  | 46.00% |  |  |  |
Purchase of equity method investment |  | $ 18.2 |  |  |  |
Proportionate share of net loss of equity method investment |  |  | $ 3.3 |  |  |
Fair value of equity method investment |  |  | 17.6 | 17.6 |  |
SSI |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Loans to equity method investee |  |  | $ 28.4 | $ 28.4 |  |
Subsequent Event | SuperSonic Imagine |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage (percent) | 78.00% |  |  |  |  |
Purchase of equity method investment | $ 12.5 |  |  |  |  |
Shares acquired in equity method investment (in shares) | 7.6 |  |  |  |  |

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