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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Apr. 30, 2020 | Jan. 31, 2020 | Apr. 30, 2019
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 77,704 | $ 308,082 | $ 322,767
Unrealized Gains | 732 | 618 | 420
Unrealized (Losses) | (43) | (151) | (130)
Fair Value | 78,393 | 308,549 | 323,057
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 65,133 | 211,149 | 229,140
Unrealized Gains | 26 | 341 | 99
Unrealized (Losses) | (38) | (37) | (76)
Fair Value | 65,121 | 211,453 | 229,163
Short-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 14,246 | 166,790 | 169,627
Unrealized Gains | 21 | 318 | 72
Unrealized (Losses) | (7) | (26) | (70)
Fair Value | 14,260 | 167,082 | 169,629
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 50,887 | 38,617 | 52,131
Unrealized Gains | 5 | 20 | 23
Unrealized (Losses) | (31) | (11) | (6)
Fair Value | 50,861 | 38,626 | 52,148
Short-term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 2,593 | 1,650
Fair Value |  | 2,593 | 1,650
Short-term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 1,152 | 2,735
Unrealized Gains |  | 3 | 4
Fair Value |  | 1,155 | 2,739
Short-term Investments | Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 1,997 | 2,997
Fair Value |  | 1,997 | 2,997
Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 12,571 | 96,933 | 93,627
Unrealized Gains | 706 | 277 | 321
Unrealized (Losses) | (5) | (114) | (54)
Fair Value | 13,272 | 97,096 | 93,894
Long Term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,572 | 47,352 | 71,105
Unrealized Gains | 3 | 205 | 95
Unrealized (Losses) | (4) | (40) | (46)
Fair Value | 2,571 | 47,517 | 71,154
Long Term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,350 | 30,340 | 11,035
Unrealized Gains | 21 | 35 | 11
Unrealized (Losses) | (1) | (17) | (8)
Fair Value | 2,370 | 30,358 | 11,038
Long Term Investments | Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 7,400 | 8,448 | 7,733
Unrealized Gains | 682 | 36 | 208
Unrealized (Losses) |  | (55) |
Fair Value | 8,082 | 8,429 | 7,941
Long Term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 249 | 3,867 | 1,403
Fair Value | $ 249 | 3,867 | 1,403
Long Term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 6,926 | 2,351
Unrealized Gains |  | 1 | 7
Unrealized (Losses) |  | (2) |
Fair Value |  | $ 6,925 | $ 2,358

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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=118939692&loc=d3e27161-111563 + Details
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