Derivatives - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Changes in value of hedged interest rate caps, net of tax of ($0.1) and $(5.3) for the three and nine months ended June 30, 2018 and $0.2 and $0.5 for the three and nine months ended July 1, 2017:	$ (0.5)	$ (0.4)	$ (4.1)	$ 0.7
Interest rate cap agreements
Derivative Instruments, Gain (Loss) [Line Items]
Changes in value of hedged interest rate caps, net of tax of ($0.1) and $(5.3) for the three and nine months ended June 30, 2018 and $0.2 and $0.5 for the three and nine months ended July 1, 2017:	$ (0.5)	$ (0.4)	$ (4.1)	$ 0.7

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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