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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. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Derivative [Line Items] |  |  |
Loss recognized in other comprehensive income (loss), net | $ (28.1) | $ (4.5) | $ (5.7)
Interest rate caps - derivative |  |  |
Derivative [Line Items] |  |  |
Loss recognized in other comprehensive income (loss), net | (0.5) | (8.0) | (5.7)
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Loss recognized in other comprehensive income (loss), net | $ (27.6) | $ 3.5 | $ 0.0

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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