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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Oct. 31, 2020 | Jan. 31, 2020 | Oct. 31, 2019
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 9,478 | $ 308,082 | $ 253,142
Unrealized Gains | 18 | 618 | 779
Unrealized (Losses) | (144) | (151) | (103)
Fair Value | 9,352 | 308,549 | 253,818
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2 | 211,149 | 170,371
Unrealized Gains |  | 341 | 352
Unrealized (Losses) |  | (37) | (26)
Fair Value | 2 | 211,453 | 170,697
Short-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2 | 166,790 | 125,040
Unrealized Gains |  | 318 | 310
Unrealized (Losses) |  | (26) | (12)
Fair Value | 2 | 167,082 | 125,338
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 38,617 | 39,256
Unrealized Gains |  | 20 | 38
Unrealized (Losses) |  | (11) | (14)
Fair Value |  | 38,626 | 39,280
Short-term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 2,593 | 2,466
Fair Value |  | 2,593 | 2,466
Short-term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 1,152 | 1,622
Unrealized Gains |  | 3 | 4
Fair Value |  | 1,155 | 1,626
Short-term Investments | Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 1,997 | 1,987
Fair Value |  | 1,997 | 1,987
Long-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 9,476 | 96,933 | 82,771
Unrealized Gains | 18 | 277 | 427
Unrealized (Losses) | (144) | (114) | (77)
Fair Value | 9,350 | 97,096 | 83,121
Long-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 30 | 47,352 | 45,556
Unrealized Gains |  | 205 | 270
Unrealized (Losses) |  | (40) | (26)
Fair Value | 30 | 47,517 | 45,800
Long-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 53 | 30,340 | 20,795
Unrealized Gains | 1 | 35 | 13
Unrealized (Losses) |  | (17) | (35)
Fair Value | 54 | 30,358 | 20,773
Long-term Investments | Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 9,393 | 8,448 | 7,661
Unrealized Gains | 17 | 36 | 144
Unrealized (Losses) | (144) | (55) | (1)
Fair Value | $ 9,266 | 8,429 | 7,804
Long-term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 3,867 | 2,394
Fair Value |  | 3,867 | 2,394
Long-term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 6,926 | 6,365
Unrealized Gains |  | 1 |
Unrealized (Losses) |  | (2) | (15)
Fair Value |  | $ 6,925 | $ 6,350

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- Definition Amount, before tax, of unrealized gain 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 (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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