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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Oct. 31, 2021 | Jan. 31, 2021 | Oct. 31, 2020
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 459,236 | $ 298,635 | $ 9,478
Unrealized Gains | 563 | 52 | 18
Unrealized (Losses) | (1,644) | (330) | (144)
Fair Value | 458,155 | 298,357 | 9,352
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 188,510 | 174,784 | 2
Unrealized Gains | 12 | 12 |
Unrealized (Losses) | (147) | (101) |
Fair Value | 188,375 | 174,695 | 2
Short-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 53,744 | 38,695 | 2
Unrealized Gains | 3 | 1 |
Unrealized (Losses) | (71) | (48) |
Fair Value | 53,676 | 38,648 | 2
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 114,818 | 127,097 |
Unrealized Gains | 9 | 11 |
Unrealized (Losses) | (73) | (53) |
Fair Value | 114,754 | 127,055 |
Short-term Investments | Treasury Bills |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 16,849 |  |
Unrealized (Losses) | (3) |  |
Fair Value | 16,846 |  |
Short-term Investments | Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,099 | 8,992 |
Fair Value | 3,099 | 8,992 |
Long-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 270,726 | 123,851 | 9,476
Unrealized Gains | 551 | 40 | 18
Unrealized (Losses) | (1,497) | (229) | (144)
Fair Value | 269,780 | 123,662 | 9,350
Long-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 174,884 | 59,890 | 30
Unrealized Gains | 1 | 3 |
Unrealized (Losses) | (1,125) | (129) |
Fair Value | 173,760 | 59,764 | 30
Long-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 78,955 | 53,134 | 53
Unrealized Gains | 8 | 17 | 1
Unrealized (Losses) | (362) | (46) |
Fair Value | 78,601 | 53,105 | 54
Long-term Investments | Treasury Bills |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 4,748 |  |
Unrealized (Losses) | (7) |  |
Fair Value | 4,741 |  |
Long-term Investments | Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 11,540 | 10,827 | 9,393
Unrealized Gains | 542 | 20 | 17
Unrealized (Losses) | (1) | (54) | (144)
Fair Value | 12,081 | $ 10,793 | $ 9,266
Long-term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 350 |  |
Unrealized (Losses) | (2) |  |
Fair Value | 348 |  |
Long-term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 249 |  |
Fair Value | $ 249 |  |

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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=123581744&loc=d3e27161-111563 + Details
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