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Summary of Significant Accounting Policies - Schedule of Unrealized Loss Recognized in AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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