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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 30, 2019 | Mar. 31, 2018 | Mar. 30, 2019 | Mar. 31, 2018 | Jan. 19, 2018
Line of Credit Facility [Line Items] |  |  |  |  |
Interest expense | $ 15,700,000 | $ 20,200,000 | $ 31,400,000 | $ 37,700,000 |
2025 Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate | 4.375% |  | 4.375% |  |
Senior Notes | 2028 Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate | 4.625% |  | 4.625% |  | 4.625%
Interest expense | $ 4,800,000 | 4,000,000 | $ 9,600,000 | 4,000,000 |
Senior Notes | 2025 Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate | 4.375% |  | 4.375% |  |
Interest expense | $ 10,900,000 | 9,400,000 | $ 21,800,000 | 12,900,000 |
Senior Notes | 2022 Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate | 5.25% |  | 5.25% |  |
Interest expense | $ 0 | $ 7,100,000 | $ 0 | $ 21,100,000 |

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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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