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Marketable Securities (Amortized Cost and Fair Value of Marketable Securities) (Details) - USD ($) $ in Thousands | Mar. 28, 2020 | Sep. 30, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 57,366 | $ 57,317
Gross unrealized gains | 85 | 146
Gross unrealized losses | (510) | (28)
Fair value | 56,941 | 57,435
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 1,482 | 999
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 1,482 | 999
Corporate notes/bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 55,884 | 56,318
Gross unrealized gains | 85 | 146
Gross unrealized losses | (510) | (28)
Fair value | $ 55,459 | $ 56,436

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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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=118939692&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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