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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Non-cash interest expense	$ 8.6	$ 15.0	$ 49.4
Senior Notes
Debt Instrument [Line Items]
Interest expense	62.7	69.2	57.3
Non-cash interest expense	2.8	3.6	3.9
Senior Notes | 2028 Senior Notes
Debt Instrument [Line Items]
Interest expense	19.2	13.3	0.0
Non-cash interest expense	$ 0.7	0.5	0.0
Interest rate (percent)	4.625%
Senior Notes | 2025 Senior Notes
Debt Instrument [Line Items]
Interest expense	$ 43.5	34.7	0.0
Non-cash interest expense	$ 2.1	1.6	0.0
Interest rate (percent)	4.375%
Senior Notes | 2022 Senior Notes
Debt Instrument [Line Items]
Interest expense	$ 0.0	21.2	57.3
Non-cash interest expense	$ 0.0	$ 1.5	$ 3.9
Interest rate (percent)		5.25%

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
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-Publisher FASB
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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
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- Definition

Aggregate amount of interest expense on all borrowings.

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-Topic 942
-SubTopic 220
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