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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Apr. 30, 2019 | Jan. 31, 2019 | Apr. 30, 2018
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 322,767 | $ 336,292 | $ 201,999
Unrealized Gains | 420 | 532 | 33
Unrealized (Losses) | (130) | (300) | (586)
Fair Value | 323,057 | 336,524 | 201,446
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 229,140 | 279,426 | 166,708
Unrealized Gains | 99 | 39 |
Unrealized (Losses) | (76) | (233) | (341)
Fair Value | 229,163 | 279,232 | 166,367
Short-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 169,627 | 227,287 | 110,657
Unrealized Gains | 72 | 24 |
Unrealized (Losses) | (70) | (214) | (294)
Fair Value | 169,629 | 227,097 | 110,363
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 52,131 | 43,677 | 54,659
Unrealized Gains | 23 | 15 |
Unrealized (Losses) | (6) | (18) | (47)
Fair Value | 52,148 | 43,674 | 54,612
Short-term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,735 | 1,458 |
Unrealized Gains | 4 |  |
Fair Value | 2,739 | 1,458 |
Short-term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,650 | 1,050 | 1,392
Fair Value | 1,650 | 1,050 | 1,392
Short-term Investments | Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,997 | 2,979 |
Fair Value | 2,997 | 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 | 93,627 | 56,866 | 35,291
Unrealized Gains | 321 | 493 | 33
Unrealized (Losses) | (54) | (67) | (245)
Fair Value | 93,894 | 57,292 | 35,079
Long Term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 71,105 | 34,265 | 18,137
Unrealized Gains | 95 | 34 |
Unrealized (Losses) | (46) | (63) | (212)
Fair Value | 71,154 | 34,236 | 17,925
Long Term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 11,035 | 7,554 | 7,873
Unrealized Gains | 11 | 7 |
Unrealized (Losses) | (8) | (3) | (30)
Fair Value | 11,038 | 7,558 | 7,843
Long Term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,351 | 6,603 |
Unrealized Gains | 7 | 2 |
Unrealized (Losses) |  | (1) |
Fair Value | 2,358 | 6,604 |
Long Term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,403 | 2,143 | 2,828
Fair Value | 1,403 | 2,143 | 2,828
Long Term Investments | Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 7,733 | 6,301 | 6,453
Unrealized Gains | 208 | 450 | 33
Unrealized (Losses) |  |  | (3)
Fair Value | $ 7,941 | $ 6,751 | $ 6,483

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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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