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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 11, 2018 | Sep. 30, 2016 | Sep. 29, 2018 | Sep. 30, 2017 | Sep. 24, 2016
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Purchase commitments, period (up to) |  |  | 150 days |  |
Total future minimum lease payments under noncancelable operating leases |  |  | $ 9,627 |  |
Typical term of leases (not exceeding) |  |  | 10 years |  |
Rent expense under cancelable and noncancelable operating leases |  |  | $ 1,200 | $ 1,100 | $ 939
VirnetX I | Pending Litigation |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Award from legal proceedings, due to other party |  | $ 302 |  |  |
Award from legal proceeding, due to other party, revised amount, determined in subsequent proceedings |  | $ 440 |  |  |
VirnetX II | Pending Litigation |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |
Award from legal proceedings, due to other party | $ 503 |  |  |  |

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- Definition Commitments and Contingencies Disclosure [Line Items] + References No definition available. + Details
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- Definition Amount awarded to other party in judgment or settlement of litigation, revised as a result of post-trial or other subsequent proceedings. + References No definition available. + Details
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- Definition Period covered by the short-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P5M13D' represents the reported fact of five months and thirteen days. + References No definition available. + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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