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Borrowings and Credit Arrangements - Additional Information (Detail) - USD ($)			3 Months Ended
	Oct. 15, 2020	Sep. 28, 2020	Dec. 26, 2020	Dec. 28, 2019	Sep. 26, 2020	Mar. 31, 2020	Dec. 17, 2018
Debt Instrument [Line Items]
Long-term debt			$ 2,764,400,000		$ 3,038,800,000
Debt extinguishment losses			21,600,000	$ 0
Long-term Debt, Current Maturities			$ 74,900,000		324,900,000
Debt Instrument, Redemption Price, Percentage		40.00%
Amended Term Loan | Percentage Added to Eurodollar Rate
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Revolver
Debt Instrument [Line Items]
Long-term Debt, Current Maturities			$ 0		250,000,000.0	$ 750,000,000.0
Debt Instrument, Unused Borrowing Capacity, Amount			1,500,000,000
Revolving credit facility borrowings							$ 1,500,000,000
Accounts Receivable Securitization
Debt Instrument [Line Items]
Repayments of Debt			250,000,000.0
Senior Notes | 2025 Senior Notes
Debt Instrument [Line Items]
Debt extinguishment losses			$ (21,600,000)
Stated interest rate			4.375%
Senior notes, face amount	$ 950,000,000.0		$ 950,000,000.0
Interest Expense, Debt			5,800,000
Debt Issuance Costs, Net			7,900,000
Debt Instrument, Unamortized Discount			$ 6,400,000
Premium payment	20,800,000
Extinguishment of Debt, Amount	$ 970,800,000
Senior Notes | 2028 Senior Notes
Debt Instrument [Line Items]
Stated interest rate			4.625%
Senior Notes | 2029 Senior Notes
Debt Instrument [Line Items]
Stated interest rate		3.25%	3.25%
Senior notes		$ 950,000,000
Debt Instrument, Offering Price, Percent Of Face Value		1
Debt Instrument, Redemption Price, Percentage		100.00%
Senior Notes | 2029 Senior Notes | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		103.25%
Senior Notes | 2029 Senior Notes | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		101.625%
Senior Notes | 2029 Senior Notes | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.813%
Senior Notes | 2029 Senior Notes | Debt Instrument, Redemption, Period Four
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
Senior Notes | 2029 Senior Notes | Debt Instrument, Redemption, Period Five
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		101.00%
2028 Senior Notes
Debt Instrument [Line Items]
Senior notes, face amount			$ 400,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of Debt			250,000,000.0
Term Loan
Debt Instrument [Line Items]
Long-term Debt, Current Maturities			74,900,000		$ 74,900,000
Debt Instrument, Unused Borrowing Capacity, Amount			$ 1,400,000,000

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