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Borrowings - (Narrative) (Details) | Mar. 27, 2019 USD ($) tranche | Mar. 27, 2020 USD ($) | Mar. 25, 2020 GBP (£) | Mar. 25, 2020 USD ($) | Sep. 27, 2019 USD ($) | Mar. 12, 2018 USD ($) | Sep. 28, 2017 USD ($) | Feb. 07, 2014 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount of long-term debt |  | $ 3,099,456,000 |  |  | $ 1,201,245,000 |  |  |
Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility fee (as a percent) | 0.08% |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility fee (as a percent) | 0.20% |  |  |  |  |  |  |
Bilateral Term Loan Facility, Convertible Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal balance of short-term debt |  |  |  |  | 200,000,000.0 |  |  |
Deferred financing fees |  |  |  |  | 100,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Available borrowing capacity |  | 679,400,000 |  |  |  |  |  |
2020 Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount of long-term debt |  | 1,032,902,000 |  |  | 0 |  |  |
Debt Instrument, Face Amount |  |  |  | $ 730,000,000.0 |  |  |  |
2020 Term Loan Facility | U.K. subsidiary |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | £ |  |  | £ 250,000,000.0 |  |  |  |  |
2017 Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount of long-term debt |  | 0 |  |  | 400,000,000 |  | $ 1,500,000,000 |
Note Purchase Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount of long-term debt |  |  |  |  |  | $ 500,000,000.0 |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of tranches | tranche | 2 |  |  |  |  |  |  |
Aggregate principal amount of long-term debt |  | 1,568,361,000 |  |  | 303,780,000 |  |  |
Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 2,250,000,000 |  |  |  |  |  |  | $ 1,600,000,000
Credit facility, potential borrowing capacity | 3,250,000,000 |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | 400,000,000.0 |  |  |  |  |  |  |
Letter of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letters of credit issued |  | 2,300,000 |  |  |  |  |  |
Letter of Credit | Committed and Uncommitted Letter-of-Credit Facilities |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Letters of credit issued |  | 260,500,000 |  |  |  |  |  |
Sub Facility Of Swing Line Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 50,000,000.0 |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal balance of short-term debt |  | 262,800,000 |  |  | $ 262,200,000 |  |  |
Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest on Senior Notes, possible increase (basis points) |  |  |  |  |  | 0.75% |  |
Senior Notes | Level 2 | Fair value |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, fair value |  | $ 525,900,000 |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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