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Marketable Securities - Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Jan. 31, 2024 | Jan. 31, 2023
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 600,636 | $ 291,726
Unrealized Gains | 2,323 | 41
Unrealized (Losses) | (2,063) | (7,545)
Fair Value | 600,896 | 284,222
Long-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 312,536 | 108,703
Unrealized Gains | 2,252 | 40
Unrealized (Losses) | (636) | (5,899)
Fair Value | 314,152 | 102,844
Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 288,100 | 183,023
Unrealized Gains | 71 | 1
Unrealized (Losses) | (1,427) | (1,646)
Fair Value | 286,744 | 181,378
Municipal And Pre-Refunded Municipal Bonds | Long-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 39,243 | 23,437
Unrealized Gains | 160 | 5
Unrealized (Losses) | (35) | (1,154)
Fair Value | 39,368 | 22,288
Municipal And Pre-Refunded Municipal Bonds | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 47,915 | 48,141
Unrealized Gains | 9 | 0
Unrealized (Losses) | (414) | (688)
Fair Value | 47,510 | 47,453
Corporate Bonds | Long-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 147,924 | 62,594
Unrealized Gains | 441 | 22
Unrealized (Losses) | (388) | (3,319)
Fair Value | 147,977 | 59,297
Corporate Bonds | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 123,418 | 83,184
Unrealized Gains | 27 | 0
Unrealized (Losses) | (883) | (947)
Fair Value | 122,562 | 82,237
US Treasury Securities | Long-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 34,604 |
Unrealized Gains | 169 |
Unrealized (Losses) | (26) |
Fair Value | 34,747 |
US Treasury Securities | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 27,231 | 23,561
Unrealized Gains | 0 | 1
Unrealized (Losses) | (36) | (10)
Fair Value | 27,195 | 23,552
Commercial Paper | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,557 | 21,636
Unrealized Gains | 0 | 0
Unrealized (Losses) | 0 | 0
Fair Value | 10,557 | 21,636
Mutual Funds, Held in Rabbi Trust | Long-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 13,817 | 13,402
Unrealized Gains | 1,344 | 0
Unrealized (Losses) | (93) | (1,424)
Fair Value | 15,068 | 11,978
Federal Government Agencies | Long-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 65,698 | 9,021
Unrealized Gains | 138 | 13
Unrealized (Losses) | (94) | (2)
Fair Value | 65,742 | 9,032
Federal Government Agencies | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 68,730 | 6,501
Unrealized Gains | 35 | 0
Unrealized (Losses) | (94) | (1)
Fair Value | 68,671 | 6,500
Certificates of Deposit | Long-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 11,250 | 249
Unrealized Gains | 0 | 0
Unrealized (Losses) | 0 | 0
Fair Value | 11,250 | $ 249
Certificates of Deposit | Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,249 |
Unrealized Gains | 0 |
Unrealized (Losses) | 0 |
Fair Value | $ 10,249 |

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