| Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities |
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 April 30, 2026, January 31, 2026 and April 30, 2025 were as follows:
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Amortized |
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Unrealized |
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Unrealized |
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Fair |
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Cost |
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Gains |
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(Losses) |
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Value |
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As of April 30, 2026 |
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Short-term Investments: |
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Corporate bonds |
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$ |
66,736 |
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|
$ |
95 |
|
|
$ |
(68 |
) |
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$ |
66,763 |
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US Treasury securities |
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|
13,465 |
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|
74 |
|
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— |
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|
13,539 |
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Municipal and pre-refunded municipal bonds |
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21,647 |
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10 |
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(2 |
) |
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21,655 |
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Federal government agencies |
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2,213 |
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1 |
|
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(3 |
) |
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|
2,211 |
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Commercial paper |
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|
7,810 |
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— |
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— |
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|
7,810 |
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111,871 |
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|
180 |
|
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(73 |
) |
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|
111,978 |
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Long-term Investments: |
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Corporate bonds |
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141,847 |
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|
116 |
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(926 |
) |
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|
141,037 |
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US Treasury securities |
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|
53,050 |
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|
148 |
|
|
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(183 |
) |
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|
53,015 |
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Mutual funds, held in rabbi trust |
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23,246 |
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|
1,691 |
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(1 |
) |
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|
24,936 |
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Municipal and pre-refunded municipal bonds |
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|
1,761 |
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|
3 |
|
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(4 |
) |
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|
1,760 |
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Federal government agencies |
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|
16,608 |
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|
|
— |
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(134 |
) |
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|
16,474 |
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Certificates of deposit |
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|
249 |
|
|
|
— |
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|
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— |
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|
|
249 |
|
|
|
|
236,761 |
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|
|
1,958 |
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(1,248 |
) |
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|
237,471 |
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|
$ |
348,632 |
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|
$ |
2,138 |
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|
$ |
(1,321 |
) |
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$ |
349,449 |
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Amortized |
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Unrealized |
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Unrealized |
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Fair |
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Cost |
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Gains |
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(Losses) |
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Value |
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As of January 31, 2026 |
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Short-term Investments: |
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Corporate bonds |
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$ |
232,594 |
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|
$ |
403 |
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|
$ |
(28 |
) |
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$ |
232,969 |
|
US Treasury securities |
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|
38,288 |
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|
174 |
|
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(2 |
) |
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|
38,460 |
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Municipal and pre-refunded municipal bonds |
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|
27,964 |
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|
26 |
|
|
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(3 |
) |
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|
27,987 |
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Federal government agencies |
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|
17,454 |
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|
32 |
|
|
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(2 |
) |
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|
17,484 |
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Commercial paper |
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|
8,824 |
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|
|
— |
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— |
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|
8,824 |
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Certificates of deposit |
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|
1,000 |
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|
|
— |
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— |
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|
1,000 |
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326,124 |
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|
635 |
|
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(35 |
) |
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326,724 |
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Long-term Investments: |
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Corporate bonds |
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330,319 |
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|
921 |
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(436 |
) |
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$ |
330,804 |
|
US Treasury securities |
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|
80,872 |
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|
520 |
|
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(20 |
) |
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|
81,372 |
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Mutual funds, held in rabbi trust |
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|
22,213 |
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|
383 |
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(1 |
) |
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|
22,595 |
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Municipal and pre-refunded municipal bonds |
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|
3,393 |
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17 |
|
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(1 |
) |
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|
3,409 |
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Federal government agencies |
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|
23,723 |
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|
10 |
|
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(55 |
) |
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23,678 |
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|
460,520 |
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|
1,851 |
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(513 |
) |
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|
461,858 |
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$ |
786,644 |
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$ |
2,486 |
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|
$ |
(548 |
) |
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$ |
788,582 |
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Amortized |
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Unrealized |
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Unrealized |
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Fair |
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Cost |
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Gains |
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(Losses) |
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Value |
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As of April 30, 2025 |
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Short-term Investments: |
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Corporate bonds |
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$ |
181,973 |
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|
$ |
102 |
|
|
$ |
(170 |
) |
|
$ |
181,905 |
|
US Treasury securities |
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|
3,952 |
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|
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— |
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(3 |
) |
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|
3,949 |
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Municipal and pre-refunded municipal bonds |
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|
43,152 |
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36 |
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(10 |
) |
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43,178 |
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Federal government agencies |
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|
38,187 |
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29 |
|
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(4 |
) |
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|
38,212 |
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Commercial paper |
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|
7,842 |
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— |
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— |
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|
7,842 |
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Certificates of deposit |
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|
10,499 |
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— |
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— |
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|
10,499 |
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|
285,605 |
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|
167 |
|
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(187 |
) |
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|
285,585 |
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Long-term Investments: |
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|
|
|
|
|
|
|
|
|
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Corporate bonds |
|
|
203,858 |
|
|
|
915 |
|
|
|
(108 |
) |
|
|
204,665 |
|
US Treasury securities |
|
|
87,179 |
|
|
|
989 |
|
|
|
— |
|
|
|
88,168 |
|
Mutual funds, held in rabbi trust |
|
|
19,764 |
|
|
|
75 |
|
|
|
(807 |
) |
|
|
19,032 |
|
Municipal and pre-refunded municipal bonds |
|
|
6,775 |
|
|
|
37 |
|
|
|
(2 |
) |
|
|
6,810 |
|
Federal government agencies |
|
|
46,308 |
|
|
|
44 |
|
|
|
(90 |
) |
|
|
46,262 |
|
Certificates of deposit |
|
|
1,000 |
|
|
|
— |
|
|
|
— |
|
|
|
1,000 |
|
|
|
|
364,884 |
|
|
|
2,060 |
|
|
|
(1,007 |
) |
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|
365,937 |
|
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|
$ |
650,489 |
|
|
$ |
2,227 |
|
|
$ |
(1,194 |
) |
|
$ |
651,522 |
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