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Marketable Securities (Narrative) (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Sep. 28, 2019 | Mar. 30, 2019
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized loss | $ (59,000) | $ (641,000)
Amortized cost on available for sale securities held at gross unrealized loss | 28,200,000 | 123,100,000
Securities in a continuous unrealized loss position for more than 12 months, amortized cost | 5,500,000 | 120,300,000
Securities in a continuous unrealized loss position for more than 12 months, aggregate unrealized loss | $ 0 | $ 600,000
Minimum |  |
Debt Securities, Available-for-sale [Line Items] |  |
Maturity period for highly-rated securities | 1 year |
Maximum |  |
Debt Securities, Available-for-sale [Line Items] |  |
Maturity period for highly-rated securities | 3 years |

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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