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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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