Derivatives - Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Jun. 27, 2020	Sep. 28, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability	$ 29.0	$ 0.0
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate swap at fair value	29.0
Derivative instruments designated as a cash flow hedge \| Interest rate cap agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate swap at fair value	0.0	4.8
Derivative instruments designated as a cash flow hedge \| Interest rate cap agreements \| Prepaid expenses and other current assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate swap at fair value	0.0	0.1
Derivative instruments designated as a cash flow hedge \| Interest Rate Swap \| Other assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.0	4.7
Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.3	2.9
Derivatives not designated as hedging instruments \| Interest Rate Swap \| Accrued expenses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate swap at fair value	5.4	0.0
Derivatives not designated as hedging instruments \| Interest Rate Swap \| Other long-term liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate swap at fair value	23.6	0.0
Derivatives not designated as hedging instruments \| Forward foreign currency contracts \| Prepaid expenses and other current assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate swap at fair value	0.2	0.9
Derivatives not designated as hedging instruments \| Forward foreign currency contracts \| Accrued expenses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate swap at fair value	0.1	0.1
Derivatives not designated as hedging instruments \| Foreign currency option contracts \| Prepaid expenses and other current assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 0.1	$ 2.0

Fair value of all asset derivatives designated as cash flow hedging instruments.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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