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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Jul. 31, 2019 | Jan. 31, 2019 | Jul. 31, 2018
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 249,916 | $ 336,292 | $ 244,023
Unrealized Gains | 469 | 532 | 182
Unrealized (Losses) | (130) | (300) | (525)
Fair Value | 250,255 | 336,524 | 243,680
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 171,206 | 279,426 | 198,460
Unrealized Gains | 232 | 39 | 10
Unrealized (Losses) | (40) | (233) | (304)
Fair Value | 171,398 | 279,232 | 198,166
Short-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 125,943 | 227,287 | 150,648
Unrealized Gains | 190 | 24 |
Unrealized (Losses) | (31) | (214) | (261)
Fair Value | 126,102 | 227,097 | 150,387
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 42,023 | 43,677 | 46,904
Unrealized Gains | 40 | 15 | 10
Unrealized (Losses) | (9) | (18) | (43)
Fair Value | 42,054 | 43,674 | 46,871
Short-term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,745 | 1,050 | 908
Fair Value | 1,745 | 1,050 | 908
Short-term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,495 | 1,458 |
Unrealized Gains | 2 |  |
Fair Value | 1,497 | 1,458 |
Short-term Investments | Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 2,979 |
Fair Value |  | 2,979 |
Short-term Investments | Treasury Bills |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 2,975 |
Unrealized (Losses) |  | (1) |
Fair Value |  | 2,974 |
Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 78,710 | 56,866 | 45,563
Unrealized Gains | 237 | 493 | 172
Unrealized (Losses) | (90) | (67) | (221)
Fair Value | 78,857 | 57,292 | 45,514
Long Term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 49,385 | 34,265 | 34,333
Unrealized Gains | 174 | 34 |
Unrealized (Losses) | (33) | (63) | (213)
Fair Value | 49,526 | 34,236 | 34,120
Long Term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 19,526 | 7,554 | 2,130
Unrealized Gains | 6 | 7 | 1
Unrealized (Losses) | (50) | (3) | (7)
Fair Value | 19,482 | 7,558 | 2,124
Long Term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,847 | 2,143 | 2,699
Fair Value | 1,847 | 2,143 | 2,699
Long Term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 126 | 6,603 |
Unrealized Gains | 1 | 2 |
Unrealized (Losses) |  | (1) |
Fair Value | 127 | 6,604 |
Long Term Investments | Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 7,826 | 6,301 | 6,401
Unrealized Gains | 56 | 450 | 171
Unrealized (Losses) | (7) |  | (1)
Fair Value | $ 7,875 | $ 6,751 | $ 6,571

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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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