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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Jan. 31, 2018 | Jan. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 224,005 | $ 155,330
Unrealized Gains | 293 | 170
Unrealized (Losses) | (485) | (145)
Fair Value | 223,813 | 155,355
Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 165,337 | 111,134
Unrealized Gains | 11 | 35
Unrealized (Losses) | (223) | (102)
Fair Value | 165,125 | 111,067
Short-term Investments | Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 111,612 | 59,403
Unrealized Gains |  | 7
Unrealized (Losses) | (184) | (90)
Fair Value | 111,428 | 59,320
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 52,474 | 51,731
Unrealized Gains | 11 | 28
Unrealized (Losses) | (39) | (12)
Fair Value | 52,446 | 51,747
Short-term Investments | Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,251 |
Fair Value | 1,251 |
Long Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 58,668 | 44,196
Unrealized Gains | 282 | 135
Unrealized (Losses) | (262) | (43)
Fair Value | 58,688 | 44,288
Long Term Investments | Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 39,853 | 19,102
Unrealized Gains |  | 9
Unrealized (Losses) | (228) | (33)
Fair Value | 39,625 | 19,078
Long Term Investments | Municipal And Pre-Refunded Municipal Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 9,873 | 19,488
Unrealized Gains | 8 | 35
Unrealized (Losses) | (24) | (9)
Fair Value | 9,857 | 19,514
Long Term Investments | Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,969 | 1,023
Fair Value | 2,969 | 1,023
Long Term Investments | Mutual Funds, Held in Rabbi Trust |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,973 | 4,583
Unrealized Gains | 274 | 91
Unrealized (Losses) | (10) | (1)
Fair Value | $ 6,237 | $ 4,673

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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