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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Jul. 31, 2020 | Jan. 31, 2020 | Jul. 31, 2019
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 9,351 | $ 308,082 | $ 249,916
Unrealized Gains | 366 | 618 | 469
Unrealized (Losses) |  | (151) | (130)
Fair Value | 9,717 | 308,549 | 250,255
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 501 | 211,149 | 171,206
Unrealized Gains |  | 341 | 232
Unrealized (Losses) |  | (37) | (40)
Fair Value | 501 | 211,453 | 171,398
Short-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 291 | 166,790 | 125,943
Unrealized Gains |  | 318 | 190
Unrealized (Losses) |  | (26) | (31)
Fair Value | 291 | 167,082 | 126,102
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 210 | 38,617 | 42,023
Unrealized Gains |  | 20 | 40
Unrealized (Losses) |  | (11) | (9)
Fair Value | 210 | 38,626 | 42,054
Short-term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 2,593 | 1,745
Fair Value |  | 2,593 | 1,745
Short-term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 1,152 | 1,495
Unrealized Gains |  | 3 | 2
Fair Value |  | 1,155 | 1,497
Short-term Investments | Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 1,997 |
Fair Value |  | 1,997 |
Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 8,850 | 96,933 | 78,710
Unrealized Gains | 366 | 277 | 237
Unrealized (Losses) |  | (114) | (90)
Fair Value | 9,216 | 97,096 | 78,857
Long Term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 30 | 47,352 | 49,385
Unrealized Gains |  | 205 | 174
Unrealized (Losses) |  | (40) | (33)
Fair Value | 30 | 47,517 | 49,526
Long Term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 53 | 30,340 | 19,526
Unrealized Gains | 1 | 35 | 6
Unrealized (Losses) |  | (17) | (50)
Fair Value | 54 | 30,358 | 19,482
Long Term Investments | Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 8,767 | 8,448 | 7,826
Unrealized Gains | 365 | 36 | 56
Unrealized (Losses) |  | (55) | (7)
Fair Value | $ 9,132 | 8,429 | 7,875
Long Term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 3,867 | 1,847
Fair Value |  | 3,867 | 1,847
Long Term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 6,926 | 126
Unrealized Gains |  | 1 | 1
Unrealized (Losses) |  | (2) |
Fair Value |  | $ 6,925 | $ 127

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