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Marketable Securities (Schedule of Available-for-sale Marketable Securities by Contractual Maturity Date) (Details) - USD ($) $ in Thousands | Jun. 27, 2020 | Sep. 30, 2019
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Investments Debt And Equity Securities [Abstract] |  |
Due in one year or less, amortized cost | $ 25,443 | $ 27,725
Due after one year through three years, amortized cost | 31,938 | 29,592
Amortized cost | 57,381 | 57,317
Due in one year or less, fair value | 25,623 | 27,735
Due after one year through three years, fair value | 32,165 | 29,700
Fair value | $ 57,788 | $ 57,435

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year through fifth year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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