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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions | Mar. 28, 2020 | Sep. 28, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Current portion of long-term debt | $ 806.1 | $ 271.4
Total long-term debt obligations | 2,749.3 | 2,783.6
Total debt obligations | 3,555.4 | 3,055.0
Term Loan |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 56.1 | 37.4
Long term debt obligations. excluding convertible notes | 1,416.2 | 1,452.4
Revolver [Member] |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 750.0 | 0.0
Securitization Program |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 0.0 | 234.0
SSI [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt obligations. excluding convertible notes | 0.6 | 0.0
2025 Senior Notes |  |
Debt Instrument [Line Items] |  |
Long term debt obligations. excluding convertible notes | 938.3 | 937.3
2028 Senior Notes |  |
Debt Instrument [Line Items] |  |
Long term debt obligations. excluding convertible notes | $ 394.2 | $ 393.9

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