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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions | Dec. 29, 2018 | Sep. 29, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Current portion of long-term debt | $ 319.4 | $ 599.7
Total long-term debt obligations | 2,807.9 | 2,704.6
Total debt obligations | 3,127.3 | 3,304.3
Term Loan |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 9.4 | 74.7
Long term debt obligations. excluding convertible notes | 1,478.9 | 1,376.3
Revolver |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 85.0 | 300.0
Securitization Program |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 225.0 | 225.0
2025 Senior Notes |  |
Debt Instrument [Line Items] |  |
Long term debt obligations. excluding convertible notes | 935.7 | 935.2
2028 Senior Notes |  |
Debt Instrument [Line Items] |  |
Long term debt obligations. excluding convertible notes | $ 393.3 | $ 393.1

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