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Debt - Credit Agreement - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 27, 2020 | Jun. 30, 2021 | Jun. 27, 2020 | Feb. 13, 2020
Debt Instrument [Line Items] |  |  |  |  |
Credit facility amount |  |  |  |  | $ 1,000,000,000
Periodic interest payment | $ 3,200,000 | $ 16,400,000 | $ 23,700,000 | $ 40,000,000.0 |
Interest rate during period | 3.10% | 4.00% | 3.40% | 4.50% |
6.000% Senior Notes Due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount paid in penalties for early redemption |  | $ 15,000,000 |  |  |
Interest rate |  | 6.00% |  | 6.00% |
Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity expansion amount |  |  |  |  | $ 500,000,000
Credit facility maturity date |  |  | Feb. 13, 2025 |  |
Basis spread on Federal Reserve Bank of New York (FRBNY) rate | 0.50% |  | 0.50% |  |
Basis spread on adjusted LIBOR |  |  | 1.00% |  |
Line of Credit | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable interest rate, length of time between updates |  |  | 30 days |  |
Credit facility commitment fees percentage |  |  | 0.175% |  |
Line of Credit | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 1.25% |  |
Line of Credit | Minimum | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 0.25% |  |
Line of Credit | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable interest rate, length of time between updates |  |  | 180 days |  |
Credit facility commitment fees percentage |  |  | 0.30% |  |
Line of Credit | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 1.75% |  |
Line of Credit | Maximum | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  |  | 0.75% |  |
Secured Debt | Revolving Loan, Reset Period One |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Annual rate for borrowings outstanding | 1.69% |  | 1.69% |  |

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