Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 27, 2020	Sep. 29, 2019	Sep. 30, 2018
Retirement Benefits [Abstract]
Employer contributions to the plans	$ 25.0	$ 23.3	$ 22.4
Assets related to deferred compensation plans	35.1	30.4
Liabilities related to deferred compensation plans	$ 35.0	$ 29.5

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_DeferredCompensationPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant