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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions	Jun. 26, 2021	Sep. 26, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Current portion of long-term debt	$ 460.6	$ 324.9
Total long-term debt obligations	2,654.7	2,713.9
Total debt obligations	3,115.3	3,038.8
Term Loan
Debt Instrument [Line Items]
Current portion of long-term debt	74.8	74.9
Long term debt obligations. excluding convertible notes	1,325.5	1,379.9
Revolver
Debt Instrument [Line Items]
Current portion of long-term debt	0.0	250.0	$ 750.0
Accounts Receivable Securitization
Debt Instrument [Line Items]
Current portion of long-term debt	320.0	0.0
Other Debt Obligations
Debt Instrument [Line Items]
Current portion of long-term debt	65.8	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	395.2	394.6
2029 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes	$ 934.0	$ 0.0

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