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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Jul. 31, 2018 | Jan. 31, 2018 | Jul. 31, 2017
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 244,023 | $ 224,005 | $ 136,122
Unrealized Gains | 182 | 293 | 131
Unrealized (Losses) | (525) | (485) | (98)
Fair Value | 243,680 | 223,813 | 136,155
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 198,460 | 165,337 | 110,250
Unrealized Gains | 10 | 11 | 19
Unrealized (Losses) | (304) | (223) | (74)
Fair Value | 198,166 | 165,125 | 110,195
Short-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 150,648 | 111,612 | 72,805
Unrealized Gains |  |  | 4
Unrealized (Losses) | (261) | (184) | (61)
Fair Value | 150,387 | 111,428 | 72,748
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 46,904 | 52,474 | 36,630
Unrealized Gains | 10 | 11 | 15
Unrealized (Losses) | (43) | (39) | (13)
Fair Value | 46,871 | 52,446 | 36,632
Short-term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 908 | 1,251 | 815
Fair Value | 908 | 1,251 | 815
Long Term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 45,563 | 58,668 | 25,872
Unrealized Gains | 172 | 282 | 112
Unrealized (Losses) | (221) | (262) | (24)
Fair Value | 45,514 | 58,688 | 25,960
Long Term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 34,333 | 39,853 | 14,906
Unrealized (Losses) | (213) | (228) | (22)
Fair Value | 34,120 | 39,625 | 14,884
Long Term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,130 | 9,873 | 3,057
Unrealized Gains | 1 | 8 | 9
Unrealized (Losses) | (7) | (24) | (2)
Fair Value | 2,124 | 9,857 | 3,064
Long Term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,699 | 2,969 | 2,726
Fair Value | 2,699 | 2,969 | 2,726
Long Term Investments | Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 6,401 | 5,973 | 5,183
Unrealized Gains | 171 | 274 | 103
Unrealized (Losses) | (1) | (10) |
Fair Value | $ 6,571 | $ 6,237 | $ 5,286

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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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