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Investments - Summary of Maturities of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jul. 29, 2018 | Jan. 28, 2018
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Investment [Line Items] |  |
Available-for-sale securities, market value | $ 2,605 | $ 1,960
Available-for-sale securities, adjusted cost | 2,605 | 1,960
Within 1 Year [Member] |  |
Investment [Line Items] |  |
Available-for-sale securities, market value | 2,000 | 1,960
Available-for-sale securities, adjusted cost | 2,000 | 1,960
After 1 Year Through 5 Years [Member] |  |
Investment [Line Items] |  |
Available-for-sale securities, market value | 605 | 0
Available-for-sale securities, adjusted cost | $ 605 | $ 0

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- Definition This item represents the cost of debt 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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