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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions	Sep. 25, 2021	Sep. 26, 2020
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	$ 313.0	$ 324.9
Total long-term debt obligations	2,712.2	2,713.9
Total debt obligations	3,025.2	3,038.8
Term Loan
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	0.0	74.9
Long term debt obligations. excluding convertible notes	1,382.3	1,379.9
Revolver
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	0.0	250.0
Securitization Program
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	248.5	0.0
2025 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes	0.0	939.4
2028 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes	395.4	394.6
Other Debt Obligations
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	64.5	0.0
2029 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes	$ 934.5	$ 0.0

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