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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Jul. 31, 2021 | Jan. 31, 2021 | Jul. 31, 2020
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 270,402 | $ 298,635 | $ 9,351
Unrealized Gains | 197 | 52 | 366
Unrealized (Losses) | (368) | (330) |
Fair Value | 270,231 | 298,357 | 9,717
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 157,077 | 174,784 | 501
Unrealized Gains | 16 | 12 |
Unrealized (Losses) | (111) | (101) |
Fair Value | 156,982 | 174,695 | 501
Short-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 28,808 | 38,695 | 291
Unrealized Gains | 2 | 1 |
Unrealized (Losses) | (24) | (48) |
Fair Value | 28,786 | 38,648 | 291
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 122,173 | 127,097 | 210
Unrealized Gains | 14 | 11 |
Unrealized (Losses) | (87) | (53) |
Fair Value | 122,100 | 127,055 | 210
Short-term Investments | Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 6,096 | 8,992 |
Fair Value | 6,096 | 8,992 |
Long-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 113,325 | 123,851 | 8,850
Unrealized Gains | 181 | 40 | 366
Unrealized (Losses) | (257) | (229) |
Fair Value | 113,249 | 123,662 | 9,216
Long-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 61,646 | 59,890 | 30
Unrealized Gains | 4 | 3 |
Unrealized (Losses) | (159) | (129) |
Fair Value | 61,491 | 59,764 | 30
Long-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 40,069 | 53,134 | 53
Unrealized Gains | 34 | 17 | 1
Unrealized (Losses) | (56) | (46) |
Fair Value | 40,047 | 53,105 | 54
Long-term Investments | Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 11,610 | 10,827 | 8,767
Unrealized Gains | 143 | 20 | 365
Unrealized (Losses) | (42) | (54) |
Fair Value | $ 11,711 | $ 10,793 | $ 9,132

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