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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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