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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Apr. 30, 2021 | Jan. 31, 2021 | Apr. 30, 2020
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 264,940 | $ 298,635 | $ 77,704
Unrealized Gains | 462 | 52 | 732
Unrealized (Losses) | (292) | (330) | (43)
Fair Value | 265,110 | 298,357 | 78,393
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 164,557 | 174,784 | 65,133
Unrealized Gains | 6 | 12 | 26
Unrealized (Losses) | (133) | (101) | (38)
Fair Value | 164,430 | 174,695 | 65,121
Short-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 48,500 | 38,695 | 14,246
Unrealized Gains | 1 | 1 | 21
Unrealized (Losses) | (49) | (48) | (7)
Fair Value | 48,452 | 38,648 | 14,260
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 106,266 | 127,097 | 50,887
Unrealized Gains | 5 | 11 | 5
Unrealized (Losses) | (84) | (53) | (31)
Fair Value | 106,187 | 127,055 | 50,861
Short-term Investments | Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 9,791 | 8,992 |
Fair Value | 9,791 | 8,992 |
Long-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 100,383 | 123,851 | 12,571
Unrealized Gains | 456 | 40 | 706
Unrealized (Losses) | (159) | (229) | (5)
Fair Value | 100,680 | 123,662 | 13,272
Long-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 48,850 | 59,890 | 2,572
Unrealized Gains | 2 | 3 | 3
Unrealized (Losses) | (111) | (129) | (4)
Fair Value | 48,741 | 59,764 | 2,571
Long-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 40,085 | 53,134 | 2,350
Unrealized Gains | 17 | 17 | 21
Unrealized (Losses) | (48) | (46) | (1)
Fair Value | 40,054 | 53,105 | 2,370
Long-term Investments | Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 11,448 | 10,827 | 7,400
Unrealized Gains | 437 | 20 | 682
Unrealized (Losses) |  | (54) |
Fair Value | $ 11,885 | $ 10,793 | 8,082
Long-term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  |  | 249
Fair Value |  |  | $ 249

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