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Borrowings and Credit Arrangements - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Mar. 28, 2020	Dec. 28, 2019	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019	Sep. 28, 2019	Jan. 19, 2018	Oct. 10, 2017
Debt Instrument [Line Items]
Long-term debt	$ 3,555,400,000			$ 3,555,400,000		$ 3,055,000,000.0
Debt extinguishment losses	0		$ 0	0	$ 800,000
Payment of debt issuance costs				0	$ 2,700,000
Senior notes							$ 1,000,000,000.0	$ 350,000,000
Borrowed principal	1,000,000,000.0			1,000,000,000.0
Long-term Debt, Current Maturities	806,100,000			$ 806,100,000		271,400,000
Amended Revolver [Member] | Percentage Added to Eurodollar Rate
Debt Instrument [Line Items]
Basis spread on variable rate				1.375%
Amended Term Loan | Percentage Added to Eurodollar Rate
Debt Instrument [Line Items]
Basis spread on variable rate				1.375%
Amended Credit Agreement
Debt Instrument [Line Items]
Debt extinguishment losses		$ (800,000)
Maximum range of present value of cash flow percentage		10.00%
Direct third party costs interest expense		$ 800,000
Payment of debt issuance costs		$ 1,900,000
Credit Agreement
Debt Instrument [Line Items]
Borrowed principal	$ 2,200,000,000			$ 2,200,000,000
2025 Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.375%			4.375%
Revolver [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	$ 750,000,000			$ 750,000,000		0
Debt Instrument, Unused Borrowing Capacity, Amount	750,000,000			750,000,000
Accounts Receivable Securitization
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	0			$ 0		$ 234,000,000.0
Repayments of Debt	$ 250,000,000
Amended Term Loan | Amended Credit Agreement
Debt Instrument [Line Items]
Periodic principal payment period				3 months
Senior Notes | 2025 Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.375%			4.375%
Offering price of principal amount							$ 1	$ 1
Senior Notes | 2028 Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.625%			4.625%			4.625%
Offering price of principal amount							$ 1
2025 Senior Notes
Debt Instrument [Line Items]
Borrowed principal							600,000,000
Senior notes, face amount	$ 950,000,000			$ 950,000,000
2028 Senior Notes
Debt Instrument [Line Items]
Borrowed principal							$ 400,000,000
Senior notes, face amount	$ 400,000,000			$ 400,000,000

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