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Marketable Securities | 6 Months Ended
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Jul. 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 July 31, 2019, January 31, 2019 and July 31, 2018 were as follows:
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of July 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 125,943 |  |  | $ | 190 |  |  | $ | (31 | ) |  | $ | 126,102 |
Municipal and pre-refunded municipal bonds |  |  | 42,023 |  |  |  | 40 |  |  |  | (9 | ) |  |  | 42,054 |
Certificates of deposit |  |  | 1,745 |  |  |  | — |  |  |  | — |  |  |  | 1,745 |
Federal government agencies |  |  | 1,495 |  |  |  | 2 |  |  |  | — |  |  |  | 1,497 |
|  |  | 171,206 |  |  |  | 232 |  |  |  | (40 | ) |  |  | 171,398 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 49,385 |  |  |  | 174 |  |  |  | (33 | ) |  |  | 49,526 |
Municipal and pre-refunded municipal bonds |  |  | 19,526 |  |  |  | 6 |  |  |  | (50 | ) |  |  | 19,482 |
Mutual funds, held in rabbi trust |  |  | 7,826 |  |  |  | 56 |  |  |  | (7 | ) |  |  | 7,875 |
Certificates of deposit |  |  | 1,847 |  |  |  | — |  |  |  | — |  |  |  | 1,847 |
Federal government agencies |  |  | 126 |  |  |  | 1 |  |  |  | — |  |  |  | 127 |
|  |  | 78,710 |  |  |  | 237 |  |  |  | (90 | ) |  |  | 78,857 |
|  | $ | 249,916 |  |  | $ | 469 |  |  | $ | (130 | ) |  | $ | 250,255 |
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 |
Certificates of deposit |  |  | 1,050 |  |  |  | — |  |  |  | — |  |  |  | 1,050 |
Federal government agencies |  |  | 1,458 |  |  |  | — |  |  |  | — |  |  |  | 1,458 |
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 |
Mutual funds, held in rabbi trust |  |  | 6,301 |  |  |  | 450 |  |  |  | — |  |  |  | 6,751 |
Certificates of deposit |  |  | 2,143 |  |  |  | — |  |  |  | — |  |  |  | 2,143 |
Federal government agencies |  |  | 6,603 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 6,604 |
|  |  | 56,866 |  |  |  | 493 |  |  |  | (67 | ) |  |  | 57,292 |
|  | $ | 336,292 |  |  | $ | 532 |  |  | $ | (300 | ) |  | $ | 336,524 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | (Losses) |  |  | Value |
As of July 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 150,648 |  |  | $ | — |  |  | $ | (261 | ) |  | $ | 150,387 |
Municipal and pre-refunded municipal bonds |  |  | 46,904 |  |  |  | 10 |  |  |  | (43 | ) |  |  | 46,871 |
Certificates of deposit |  |  | 908 |  |  |  | — |  |  |  | — |  |  |  | 908 |
|  |  | 198,460 |  |  |  | 10 |  |  |  | (304 | ) |  |  | 198,166 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 34,333 |  |  |  | — |  |  |  | (213 | ) |  |  | 34,120 |
Municipal and pre-refunded municipal bonds |  |  | 2,130 |  |  |  | 1 |  |  |  | (7 | ) |  |  | 2,124 |
Mutual funds, held in rabbi trust |  |  | 6,401 |  |  |  | 171 |  |  |  | (1 | ) |  |  | 6,571 |
Certificates of deposit |  |  | 2,699 |  |  |  | — |  |  |  | — |  |  |  | 2,699 |
|  |  | 45,563 |  |  |  | 172 |  |  |  | (221 | ) |  |  | 45,514 |
|  | $ | 244,023 |  |  | $ | 182 |  |  | $ | (525 | ) |  | $ | 243,680 |
Proceeds from the sales and maturities of available-for-sale securities were $320,411 and $130,029 for the six months ended July 31, 2019 and 2018, respectively. The Company included in “Other income, net,” in the Condensed Consolidated Statements of Income, net realized gains of $19 and $26 for the three and six months ended July 31, 2019, respectively, and net realized losses of $0 and $13 for the three and six months ended July 31, 2018, respectively. Amortization of discounts and premiums, net, resulted in a reduction of “Other income, net” of $152 and $271 for the three and six months ended July 31, 2019, respectively, and $517 and $1,151 for the three and six months ended July 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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