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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Oct. 31, 2018 | Jan. 31, 2018 | Oct. 31, 2017
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 274,604 | $ 224,005 | $ 134,541
Unrealized Gains |  | 293 | 117
Unrealized (Losses) | (1,180) | (485) | (176)
Fair Value | 273,424 | 223,813 | 134,482
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 237,916 | 165,337 | 93,307
Unrealized Gains |  | 11 | 6
Unrealized (Losses) | (525) | (223) | (85)
Fair Value | 237,391 | 165,125 | 93,228
Short-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 200,910 | 111,612 | 67,275
Unrealized Gains |  |  | 2
Unrealized (Losses) | (466) | (184) | (71)
Fair Value | 200,444 | 111,428 | 67,206
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 33,291 | 52,474 | 24,676
Unrealized Gains |  | 11 | 4
Unrealized (Losses) | (59) | (39) | (14)
Fair Value | 33,232 | 52,446 | 24,666
Short-term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 755 | 1,251 | 1,356
Fair Value | 755 | 1,251 | 1,356
Short-term Investments | Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,960 |  |
Fair Value | 2,960 |  |
Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 36,688 | 58,668 | 41,234
Unrealized Gains |  | 282 | 111
Unrealized (Losses) | (655) | (262) | (91)
Fair Value | 36,033 | 58,688 | 41,254
Long Term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 24,793 | 39,853 | 30,051
Unrealized Gains |  |  | 2
Unrealized (Losses) | (175) | (228) | (87)
Fair Value | 24,618 | 39,625 | 29,966
Long Term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,573 | 9,873 | 1,362
Unrealized Gains |  | 8 |
Unrealized (Losses) | (7) | (24) | (2)
Fair Value | 2,566 | 9,857 | 1,360
Long Term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,390 | 2,969 | 4,182
Fair Value | 2,390 | 2,969 | 4,182
Long Term Investments | Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 6,932 | 5,973 | 5,639
Unrealized Gains |  | 274 | 109
Unrealized (Losses) | (473) | (10) | (2)
Fair Value | $ 6,459 | $ 6,237 | $ 5,746

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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=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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