Fair Value (Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation) (Details) - Fair Value, Measurements, Recurring [Member] $ in Millions	9 Months Ended
	Jun. 29, 2018 USD ($)
Fair Value, Liabilities [Roll Forward]
Balance as of September 29, 2017	$ 11.9
Balance as of June 29, 2018	4.1
Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities [Roll Forward]
Balance as of September 29, 2017	11.9
Balance as of June 29, 2018	4.1
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration [Member]
Fair Value, Liabilities [Roll Forward]
Balance as of September 29, 2017	11.9
Decreases to contingent consideration included in earnings	(7.8)
Balance as of June 29, 2018	$ 4.1