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Borrowings and Credit Arrangements - Interest Expense Credit Agreement (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017 | Sep. 24, 2016
Line of Credit Facility [Line Items] |  |  |  |
Non-cash interest expense | $ 8.6 | $ 15.0 | $ 49.4 |
2018 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest expense | 67.0 |  |  |
Non-cash interest expense | $ 2.6 |  |  |
Weighted average interest rate | 3.79% |  |  |
Interest rate at end of period | 3.43% |  |  |
2017 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest expense |  | 60.8 |  |
Non-cash interest expense |  | $ 2.6 |  |
Weighted average interest rate |  | 3.23% |  |
Interest rate at end of period |  | 3.74% |  |
Prior Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest expense |  |  | 42.3 |
Non-cash interest expense |  |  | $ 4.2 |
Weighted average interest rate |  |  | 2.39% |
Interest rate at end of period |  |  |  | 2.73%

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- 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) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 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=114775744&loc=d3e28555-108399 + Details
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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 -Paragraph 1 -Subparagraph (SX 210.9-04.7,8) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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- Definition The effective interest rate at the end of the reporting period. + References 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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