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Income Taxes (Income Tax Benefits Realized from the Exercise of Nonqualified Stock Options, and Disqualifying Dispositions of Stock Sold Under our Employee Stock Purchase Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Income Tax Disclosure [Abstract]
Income tax benefits realized under stock plans	$ 7.9	$ 2.2	$ 1.8

X

- Definition

Amount of tax benefit from exercise of option under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901

+ Details

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Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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