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Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities (Detail) - USD ($) $ in Thousands | Oct. 31, 2019 | Jan. 31, 2019 | Oct. 31, 2018
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 253,142 | $ 336,292 | $ 274,604
Unrealized Gains | 779 | 532 |
Unrealized (Losses) | (103) | (300) | (1,180)
Fair Value | 253,818 | 336,524 | 273,424
Short-term Investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 170,371 | 279,426 | 237,916
Unrealized Gains | 352 | 39 |
Unrealized (Losses) | (26) | (233) | (525)
Fair Value | 170,697 | 279,232 | 237,391
Short-term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 125,040 | 227,287 | 200,910
Unrealized Gains | 310 | 24 |
Unrealized (Losses) | (12) | (214) | (466)
Fair Value | 125,338 | 227,097 | 200,444
Short-term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 39,256 | 43,677 | 33,291
Unrealized Gains | 38 | 15 |
Unrealized (Losses) | (14) | (18) | (59)
Fair Value | 39,280 | 43,674 | 33,232
Short-term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,622 | 1,458 |
Unrealized Gains | 4 |  |
Fair Value | 1,626 | 1,458 |
Short-term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,466 | 1,050 | 755
Fair Value | 2,466 | 1,050 | 755
Short-term Investments | Commercial Paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,987 | 2,979 | 2,960
Fair Value | 1,987 | 2,979 | 2,960
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 | 82,771 | 56,866 | 36,688
Unrealized Gains | 427 | 493 |
Unrealized (Losses) | (77) | (67) | (655)
Fair Value | 83,121 | 57,292 | 36,033
Long Term Investments | Corporate Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 45,556 | 34,265 | 24,793
Unrealized Gains | 270 | 34 |
Unrealized (Losses) | (26) | (63) | (175)
Fair Value | 45,800 | 34,236 | 24,618
Long Term Investments | Municipal And Pre-Refunded Municipal Bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 20,795 | 7,554 | 2,573
Unrealized Gains | 13 | 7 |
Unrealized (Losses) | (35) | (3) | (7)
Fair Value | 20,773 | 7,558 | 2,566
Long Term Investments | Federal Government Agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 6,365 | 6,603 |
Unrealized Gains |  | 2 |
Unrealized (Losses) | (15) | (1) |
Fair Value | 6,350 | 6,604 |
Long Term Investments | Certificates of Deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,394 | 2,143 | 2,390
Fair Value | 2,394 | 2,143 | 2,390
Long Term Investments | Mutual Funds, Held in Rabbi Trust |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 7,661 | 6,301 | 6,932
Unrealized Gains | 144 | 450 |
Unrealized (Losses) | (1) |  | (473)
Fair Value | $ 7,804 | $ 6,751 | $ 6,459

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