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Derivatives - Fair Value of Derivative Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 27, 2021
Sep. 26, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative liability $ 24.9 $ 31.2
Interest rate swap    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Interest rate swap at fair value 24.9  
Derivatives not designated as hedging instruments    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative asset 1.1 11.2
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 0.0 1.1
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 3.0 0.0
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 1.1 10.1
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 11.0 8.2
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 $ 13.9 $ 23.0