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Borrowings and Credit Arrangements - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 03, 2017 USD ($) | Mar. 30, 2019 USD ($) | Dec. 29, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 30, 2017 USD ($) | Mar. 30, 2019 USD ($) | Mar. 31, 2018 USD ($) | Apr. 26, 2019 USD ($) | Dec. 17, 2018 USD ($) | Sep. 29, 2018 USD ($) | Feb. 15, 2018 USD ($) | Jan. 19, 2018 USD ($) | Oct. 10, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 3,110,400,000 |  |  |  | $ 3,110,400,000 |  |  |  | $ 3,304,300,000 |  |  |
Debt extinguishment losses |  | 0 |  | $ 44,900,000 |  | 800,000 | $ 45,900,000 |  |  |  |  |  |
Payment of debt issuance costs |  |  |  |  |  | 2,700,000 | 23,500,000 |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 | $ 350,000,000
Borrowed principal |  | $ 1,000,000,000 |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |
Debt discount |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |
Amended Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |
Amended Term Loan | Percentage Added to Eurodollar Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.375% |  |  |  |  |  |  |
Amended Revolver | Percentage Added to Eurodollar Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.375% |  |  |  |  |  |  |
Amended Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio maximum |  | 5.00 |  |  |  |  |  |  |  |  |  |  |
Decreased net leverage ratio pursuant to senior secured credit facility |  | 4.50 |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  | 3.75 |  |  |  |  |  |  |  |  |  |  |
Number of fiscal quarters ending on measurement date |  | 4 |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment losses |  |  | $ (800,000) |  | $ (1,000,000) |  |  |  |  |  |  |  |
Maximum range of present value of cash flow percentage |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Direct third party costs interest expense |  |  | $ 800,000 |  |  |  | $ 1,700,000 |  |  |  |  |  |
Payment of debt issuance costs |  |  |  |  |  | $ 1,900,000 |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt | $ 1,320,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Borrowed principal |  | $ 1,600,000,000 |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  |
2025 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 4.375% |  |  |  | 4.375% |  |  |  |  |  |  |
2022 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment losses |  |  |  | 44,900,000 |  |  |  |  |  |  |  |  |
Direct third party costs interest expense |  |  |  | $ 2,600,000 |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  |
Stated interest rate |  | 5.25% |  |  |  | 5.25% |  |  |  |  |  |  |
Offering price of principal amount |  |  |  |  |  |  |  |  |  |  | 1,040,000,000 |  |
Make whole provision |  |  |  |  |  |  |  |  |  |  | $ 37,700,000 |  |
Accounts Receivable Securitization [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 300,000,000 |  |  |  | $ 300,000,000 |  |  |  |  |  |  |
Borrowed principal |  | 207,000,000 |  |  |  | $ 207,000,000 |  |  |  |  |  |  |
Amended Term Loan | Amended Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic principal payment period |  |  |  |  |  | 3 months |  |  |  |  |  |  |
Long-term debt |  | $ 1,200,000,000 |  |  |  | $ 1,200,000,000 |  |  |  |  |  |  |
Amended Term Loan | Amended Credit Agreement | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic principal payment |  |  |  |  |  | 9,375,000 |  |  |  |  |  |  |
Amended Term Loan | Amended Credit Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic principal payment |  |  |  |  |  | $ 28,125,000 |  |  |  |  |  |  |
Secured Term Loan | Amended Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |
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 |  |  |  |  |  |  |
Subsequent Event | Accounts Receivable Securitization [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Borrowings |  |  |  |  |  |  |  | $ 43,000,000 |  |  |  |  |

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