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Investments - Schedule of Available-For-Sale Securities, Classified by Maturity Period (Details) - USD ($) $ in Thousands | Jan. 27, 2019 | Jan. 28, 2018
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Investments [Abstract] |  |
Available-for-sale securities, Market Value - Within 1 year | $ 3,105 |
Available-for-sale securities, Adjusted Cost - Within 1 year | 3,105 |
Available-for-sale securities, Market Value - After 1 year through 5 years | 0 |
Available-for-sale securities, Adjusted Cost - After 1 year through 5 years | 0 |
Available-for-sale securities, Market Value - Total investments | 3,105 | $ 1,960
Adjusted Cost | $ 3,105 | $ 1,960

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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=82897076&loc=d3e27161-111563 + 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 second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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