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

Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration