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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Jan. 31, 2019 | Jan. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 336,292 | $ 224,005
Unrealized Gains | 532 | 293
Unrealized (Losses) | (300) | (485)
Fair Value | 336,524 | 223,813
Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 279,426 | 165,337
Unrealized Gains | 39 | 11
Unrealized (Losses) | (233) | (223)
Fair Value | 279,232 | 165,125
Short-term Investments | Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 227,287 | 111,612
Unrealized Gains | 24 |
Unrealized (Losses) | (214) | (184)
Fair Value | 227,097 | 111,428
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 43,677 | 52,474
Unrealized Gains | 15 | 11
Unrealized (Losses) | (18) | (39)
Fair Value | 43,674 | 52,446
Short-term Investments | Federal Government Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,458 |
Fair Value | 1,458 |
Short-term Investments | Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,050 | 1,251
Fair Value | 1,050 | 1,251
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 | 56,866 | 58,668
Unrealized Gains | 493 | 282
Unrealized (Losses) | (67) | (262)
Fair Value | 57,292 | 58,688
Long Term Investments | Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 34,265 | 39,853
Unrealized Gains | 34 |
Unrealized (Losses) | (63) | (228)
Fair Value | 34,236 | 39,625
Long Term Investments | Municipal And Pre-Refunded Municipal Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,554 | 9,873
Unrealized Gains | 7 | 8
Unrealized (Losses) | (3) | (24)
Fair Value | 7,558 | 9,857
Long Term Investments | Federal Government Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,603 |
Unrealized Gains | 2 |
Unrealized (Losses) | (1) |
Fair Value | 6,604 |
Long Term Investments | Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,143 | 2,969
Fair Value | 2,143 | 2,969
Long Term Investments | Mutual Funds, Held in Rabbi Trust |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,301 | 5,973
Unrealized Gains | 450 | 274
Unrealized (Losses) |  | (10)
Fair Value | $ 6,751 | $ 6,237

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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 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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