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Fair Value of Financial Instruments - Summary of Income Recognized from Equity Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 03, 2021	Dec. 29, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain on equity investments held	$ 0.8	$ 38.5
Realized gain on equity investments sold	5.2	0.0
Gain on equity investments	6.0	38.5
Energizer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gain on equity investments held	0.8	38.5
Realized gain on equity investments sold	5.2	0.0
Gain on equity investments	6.0	38.5
Dividend income from equity investments	0.2	1.6
Gain from equity investments	$ 6.2	$ 40.1

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Amount of realized and unrealized gain (loss) on investment.

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