Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions	Jun. 25, 2022	Sep. 25, 2021
Debt Instrument [Line Items]
Current portion of long-term debt	$ 7.5	$ 313.0
Total long-term debt obligations	2,814.6	2,712.2
Total debt obligations	2,822.1	3,025.2
Term Loan
Debt Instrument [Line Items]
Current portion of long-term debt	7.5	0.0
Long term debt obligations. excluding convertible notes	1,482.6	1,382.3
Accounts Receivable Securitization
Debt Instrument [Line Items]
Current portion of long-term debt	0.0	248.5
Other Debt Obligations
Debt Instrument [Line Items]
Current portion of long-term debt	0.0	64.5
2028 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes	395.9	395.4
2029 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes	$ 936.1	$ 934.5

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