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Marketable Securities (Details) - USD ($) $ in Thousands | Jul. 02, 2021 | Oct. 02, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | $ 0 |
Available-for-sale Securities, Gross Unrealized Loss | 0 |
Other Current Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities | 129,200 | $ 408,100
Other Noncurrent Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities | 3,900 | 5,200
US Treasury and Government [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 300
US Treasury and Government [Member] | Other Current Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities | 10,500 | 129,400
US Treasury and Government [Member] | Other Noncurrent Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities | 3,300 | 5,000
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 200
Corporate Debt Securities [Member] | Other Current Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities | 106,800 | 276,800
Corporate Debt Securities [Member] | Other Noncurrent Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities | 0 | 0
US States and Political Subdivisions Debt Securities [Member] | Other Current Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities | 11,900 | 1,900
US States and Political Subdivisions Debt Securities [Member] | Other Noncurrent Assets [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities | $ 600 | $ 200

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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