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Borrowings and Credit Arrangements - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 27, 2020 | Mar. 28, 2020 | Jun. 29, 2019 | Dec. 29, 2018 | Jun. 27, 2020 | Jun. 29, 2019 | Sep. 28, 2019 | Jan. 19, 2018 | Oct. 10, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | $ 3,296,800,000 |  |  |  | $ 3,296,800,000 |  | $ 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 | 565,500,000 |  |  |  | $ 565,500,000 |  | 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 | $ 2,000,000,000.0 |  |  |  | $ 2,000,000,000.0 |  |  |  |
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 | $ 500,000,000.0 | $ 750,000,000 |  |  | $ 500,000,000.0 |  | 0 |  |
Debt Instrument, Unused Borrowing Capacity, Amount | 1,000,000,000.0 |  |  |  | 1,000,000,000.0 |  |  |  |
Accounts Receivable Securitization |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt, Current Maturities | 0 |  |  |  | $ 0 |  | $ 234,000,000.0 |  |
Repayments of Debt | $ 250,000,000 | $ 250,000,000.0 |  |  |  |  |  |  |
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 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | 1,000,000,000 |  |  |  | $ 1,000,000,000 |  |  |  |
Repayments of Debt | $ 250,000,000.0 |  |  |  |  |  |  |  |

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