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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - Senior Notes - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Debt Instrument [Line Items]
Interest expense	$ 54.2	$ 62.7	$ 62.7
Non-cash interest expense	2.9	2.8	2.8
2028 Senior Notes
Debt Instrument [Line Items]
Interest expense	19.2	19.2	19.2
Non-cash interest expense	$ 0.7	0.7	0.7
Interest rate (percent)	4.625%
2025 Senior Notes
Debt Instrument [Line Items]
Interest expense	$ 2.3	43.5	43.5
Non-cash interest expense	$ 0.1	2.1	2.1
Interest rate (percent)	4.375%
2029 Senior Notes
Debt Instrument [Line Items]
Interest expense	$ 32.7	0.0	0.0
Non-cash interest expense	$ 2.1	$ 0.0	$ 0.0
Interest rate (percent)	3.25%

X

- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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- Definition

Aggregate amount of interest expense on all borrowings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
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