Derivatives - Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Dec. 29, 2018	Sep. 29, 2018
Derivative instruments designated as a cash flow hedge | Interest rate cap agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	$ 3.3	$ 7.7
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]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	3.3	6.0
Derivative instruments designated as a cash flow hedge | Interest rate cap agreements | Other assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	0.0	1.7
Derivatives not designated as hedging instruments | Forward foreign currency contracts | Prepaid expenses and other current assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	6.6	3.2
Derivatives not designated as hedging instruments | Forward foreign currency contracts | Accrued Expenses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cash Flow Hedge Derivative Instrument Assets at Fair Value	$ 0.3	$ 0.2