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Marketable Securities | 9 Months Ended
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Oct. 31, 2019
Investments Debt And Equity Securities [Abstract] |
Marketable Securities | 4. Marketable Securities During all periods shown, marketable securities are classified as available-for-sale. The amortized cost, gross unrealized gains (losses) and fair value of available-for-sale securities by major security type and class of security as of October 31, 2019, January 31, 2019 and October 31, 2018 were as follows:
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of October 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 125,040 |  |  | $ | 310 |  |  | $ | (12 | ) |  | $ | 125,338 |
Municipal and pre-refunded municipal bonds |  |  | 39,256 |  |  |  | 38 |  |  |  | (14 | ) |  |  | 39,280 |
Federal government agencies |  |  | 1,622 |  |  |  | 4 |  |  |  | — |  |  |  | 1,626 |
Certificates of deposit |  |  | 2,466 |  |  |  | — |  |  |  | — |  |  |  | 2,466 |
Commercial paper |  |  | 1,987 |  |  |  | — |  |  |  | — |  |  |  | 1,987 |
|  |  | 170,371 |  |  |  | 352 |  |  |  | (26 | ) |  |  | 170,697 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 45,556 |  |  |  | 270 |  |  |  | (26 | ) |  |  | 45,800 |
Municipal and pre-refunded municipal bonds |  |  | 20,795 |  |  |  | 13 |  |  |  | (35 | ) |  |  | 20,773 |
Federal government agencies |  |  | 6,365 |  |  |  | — |  |  |  | (15 | ) |  |  | 6,350 |
Mutual funds, held in rabbi trust |  |  | 7,661 |  |  |  | 144 |  |  |  | (1 | ) |  |  | 7,804 |
Certificates of deposit |  |  | 2,394 |  |  |  | — |  |  |  | — |  |  |  | 2,394 |
|  |  | 82,771 |  |  |  | 427 |  |  |  | (77 | ) |  |  | 83,121 |
|  | $ | 253,142 |  |  | $ | 779 |  |  | $ | (103 | ) |  | $ | 253,818 |
As of January 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 227,287 |  |  | $ | 24 |  |  | $ | (214 | ) |  | $ | 227,097 |
Municipal and pre-refunded municipal bonds |  |  | 43,677 |  |  |  | 15 |  |  |  | (18 | ) |  |  | 43,674 |
Federal government agencies |  |  | 1,458 |  |  |  | — |  |  |  | — |  |  |  | 1,458 |
Certificates of deposit |  |  | 1,050 |  |  |  | — |  |  |  | — |  |  |  | 1,050 |
Commercial paper |  |  | 2,979 |  |  |  | — |  |  |  | — |  |  |  | 2,979 |
Treasury bills |  |  | 2,975 |  |  |  | — |  |  |  | (1 | ) |  |  | 2,974 |
|  |  | 279,426 |  |  |  | 39 |  |  |  | (233 | ) |  |  | 279,232 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 34,265 |  |  |  | 34 |  |  |  | (63 | ) |  |  | 34,236 |
Municipal and pre-refunded municipal bonds |  |  | 7,554 |  |  |  | 7 |  |  |  | (3 | ) |  |  | 7,558 |
Federal government agencies |  |  | 6,603 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 6,604 |
Mutual funds, held in rabbi trust |  |  | 6,301 |  |  |  | 450 |  |  |  | — |  |  |  | 6,751 |
Certificates of deposit |  |  | 2,143 |  |  |  | — |  |  |  | — |  |  |  | 2,143 |
|  |  | 56,866 |  |  |  | 493 |  |  |  | (67 | ) |  |  | 57,292 |
|  | $ | 336,292 |  |  | $ | 532 |  |  | $ | (300 | ) |  | $ | 336,524 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of October 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 200,910 |  |  | $ | — |  |  | $ | (466 | ) |  | $ | 200,444 |
Municipal and pre-refunded municipal bonds |  |  | 33,291 |  |  |  | — |  |  |  | (59 | ) |  |  | 33,232 |
Certificates of deposit |  |  | 755 |  |  |  | — |  |  |  | — |  |  |  | 755 |
Commercial paper |  |  | 2,960 |  |  |  | — |  |  |  | — |  |  |  | 2,960 |
|  |  | 237,916 |  |  |  | — |  |  |  | (525 | ) |  |  | 237,391 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 24,793 |  |  |  | — |  |  |  | (175 | ) |  |  | 24,618 |
Municipal and pre-refunded municipal bonds |  |  | 2,573 |  |  |  | — |  |  |  | (7 | ) |  |  | 2,566 |
Mutual funds, held in rabbi trust |  |  | 6,932 |  |  |  | — |  |  |  | (473 | ) |  |  | 6,459 |
Certificates of deposit |  |  | 2,390 |  |  |  | — |  |  |  | — |  |  |  | 2,390 |
|  |  | 36,688 |  |  |  | — |  |  |  | (655 | ) |  |  | 36,033 |
|  | $ | 274,604 |  |  | $ | — |  |  | $ | (1,180 | ) |  | $ | 273,424 |
Proceeds from the sales and maturities of available-for-sale securities were $382,629 and $211,174 for the nine months ended October 31, 2019 and 2018, respectively. The Company included in “Other income, net,” in the Condensed Consolidated Statements of Income, net realized gains of $6 and $32 for the three and nine months ended October 31, 2019, respectively, and net realized losses of $3 and $16 for the three and nine months ended October 31, 2018, respectively. Amortization of discounts and premiums, net, resulted in a reduction of “Other income, net” of $156 and $427 for the three and nine months ended October 31, 2019, respectively, and $328 and $1,479 for the three and nine months ended October 31, 2018, respectively. Mutual funds represent assets held in an irrevocable rabbi trust for the Company’s Non-qualified Deferred Compensation Plan (“NQDC”). These assets are a source of funds to match the funding obligations to participants in the NQDC but are subject to the Company’s general creditors. The Company elected the fair value option for financial assets for the mutual funds held in the rabbi trust resulting in all unrealized gains and losses being recorded in “Other income, net” in the Condensed Consolidated Statements of Income.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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