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Summary of Significant Accounting Policies - Schedule of Unrealized Loss Recognized in AOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Derivative [Line Items]      
Loss recognized in other comprehensive income (loss), net $ 9.8 $ (28.1) $ (4.5)
Interest rate caps - derivative      
Derivative [Line Items]      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax 0.4 (0.5) (8.0)
Interest Rate Swap [Member]      
Derivative [Line Items]      
Loss recognized in other comprehensive income (loss), net $ 9.4 $ (27.6) $ 3.5