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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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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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