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Fair Value Measurements - Fair Value of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | May 02, 2020 | Aug. 03, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | $ 144,744 | $ 143,276
Over One Year Through Five Years | 86,919 | 53,372
Over Five Years | 0 | 0
Total | 231,663 | 196,648
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 45,495 | 44,772
Over One Year Through Five Years | 24,857 | 5,135
Over Five Years | 0 | 0
Total | 70,352 | 49,907
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 31,154 | 29,761
Over One Year Through Five Years | 0 | 0
Over Five Years | 0 | 0
Total | 31,154 | 29,761
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 6,162 | 5,412
Over One Year Through Five Years | 40,748 | 37,320
Over Five Years | 0 | 0
Total | 46,910 | 42,732
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 61,933 | 63,331
Over One Year Through Five Years | 21,314 | 10,917
Over Five Years | 0 | 0
Total | $ 83,247 | $ 74,248

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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 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=118939692&loc=d3e27198-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 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=118939692&loc=d3e27161-111563 + 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), maturing in next 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 (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563 Reference 2: 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=118939692&loc=d3e27161-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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