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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Debt Instrument [Line Items]
Non-cash interest expense	$ 15.0	$ 49.4	$ 52.1
2025 Senior Notes
Debt Instrument [Line Items]
Interest rate	4.375%
Senior Notes
Debt Instrument [Line Items]
Interest expense	$ 69.2	57.3	56.0
Non-cash interest expense	3.6	3.9	3.8
Senior Notes | 2028 Senior Notes
Debt Instrument [Line Items]
Interest expense	13.3	0.0	0.0
Non-cash interest expense	$ 0.5	0.0	0.0
Interest rate	4.625%
Senior Notes | 2025 Senior Notes
Debt Instrument [Line Items]
Interest expense	$ 34.7	0.0	0.0
Non-cash interest expense	$ 1.6	0.0	0.0
Interest rate	4.375%
Senior Notes | 2022 Senior Notes
Debt Instrument [Line Items]
Interest expense	$ 21.2	57.3	56.0
Non-cash interest expense	$ 1.5	$ 3.9	$ 3.8
Interest rate	5.25%

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Aggregate amount of interest expense on all borrowings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.7,8)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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