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Borrowings - Narrative (Details) $ in Thousands, £ in Millions |  |  |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 18, 2023 USD ($) | Feb. 16, 2023 USD ($) | Feb. 06, 2023 USD ($) | Feb. 06, 2023 GBP (£) | Mar. 27, 2019 | Dec. 29, 2023 USD ($) | Dec. 30, 2022 USD ($) | Sep. 29, 2023 USD ($) | Feb. 13, 2023 USD ($) | Sep. 30, 2022 USD ($) derivative_agreement | Mar. 25, 2020 USD ($) | Mar. 25, 2020 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term borrowings |  |  |  |  |  | $ 540,401 | $ 1,282,000 |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  | 311,500 |  | $ 322,000 |  |  |  |
Treasury Lock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments held | derivative_agreement |  |  |  |  |  |  |  |  |  | 2 |  |
Derivative notional amount |  |  |  |  |  |  |  |  |  | $ 500,000 |  |
Fixed Rate Date | Treasury Lock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 500,000 | $ 500,000 |  |  |
2021 Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term borrowings |  |  | $ 200,000 | £ 650.0 |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | 80,000 |  |  |  |  |  |
2020 Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 730,000 |
2020 Term Loan Facility | U.K. subsidiary |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | £ |  |  |  |  |  |  |  |  |  |  |  | £ 250.0
5.90% Bonds | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 500,000 |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.90% |  |  |  |  |  |  |  |  |  |
Interest rate, increase (decrease) over period |  | 0.35% |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 100.00% |  |  |  |  |  |  |  |  |  |
6.35% Bonds | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 600,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate | 6.35% |  |  |  |  |  |  |  |  |  |  |
Interest rate, increase (decrease) over period | 0.30% |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  |  |  |  | 2,250,000 |  |  |  |  |  |
Revolving Credit Facility | Unsecured Revolving Credit Facility February 6, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  | $ 2,250,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Second Amendment to the Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Covenant, leverage ratio, maximum |  |  |  |  | 3.50 |  |  |  |  |  |  |
Covenant, leverage ratio, temporary maximum |  |  |  |  | 4.00 |  |  |  |  |  |  |
Revolving Credit Facility | Second Amendment to the Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  |  | 0.10% |  |  |  |  |  |  |
Revolving Credit Facility | Second Amendment to the Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  |  | 0.25% |  |  |  |  |  |  |
Revolving Credit Facility | 2021 Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Covenant, leverage ratio, maximum |  |  | 3.50 |  |  |  |  |  |  |  |  |
Covenant, leverage ratio, temporary maximum |  |  | 4.00 |  |  |  |  |  |  |  |  |
Revolving Credit Facility | 2020 Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Covenant, leverage ratio, maximum |  |  | 3.50 |  |  |  |  |  |  |  |  |
Covenant, leverage ratio, temporary maximum |  |  | 4.00 |  |  |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  | $ 400,000 |  |  |  |  |  |  |  |  |
Letter of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | 900 |  |  |  |  |  |
Letter of Credit | Committed and Uncommitted Letter-of-Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | $ 310,700 |  |  |  |  |  |
Sub Facility Of Swing Line Loans |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  | $ 100,000 |  |  |  |  |  |  |  |  |

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