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Fair Value Measurements - Fair Value of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Jan. 30, 2021 | Aug. 01, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | $ 166,957 | $ 143,037
Over One Year Through Five Years | 62,395 | 95,097
Over Five Years | 0 | 0
Total | 229,352 | 238,134
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 70,397 | 38,794
Over One Year Through Five Years | 0 | 29,056
Over Five Years | 0 | 0
Total | 70,397 | 67,850
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 11,350 | 6,150
Over One Year Through Five Years | 0 | 0
Over Five Years | 0 | 0
Total | 11,350 | 6,150
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 41,987 | 35,331
Over One Year Through Five Years | 0 | 0
Over Five Years | 0 | 0
Total | 41,987 | 35,331
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 6,095 | 6,657
Over One Year Through Five Years | 16,851 | 38,603
Over Five Years | 0 | 0
Total | 22,946 | 45,260
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 37,128 | 56,105
Over One Year Through Five Years | 45,544 | 27,438
Over Five Years | 0 | 0
Total | $ 82,672 | $ 83,543

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- Definition Fair value 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 current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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 (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 + Details
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- Definition Fair value 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 fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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