XML 40 R27.htm IDEA: XBRL DOCUMENT
v3.22.1

Marketable Securities (Tables) | 12 Months Ended
--- | ---
Jan. 31, 2022
Investments Debt And Equity Securities [Abstract] |
Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Available-For-Sale Securities | The amortized cost, gross unrealized gains (losses) and fair values of available-for-sale securities by major security type and class of security as of January 31, 2022 and 2021 are as follows:
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized (Losses) |  |  | Fair Value |
As of January 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 85,062 |  |  | $ | 1 |  |  | $ | (200 | ) |  | $ | 84,863 |
Municipal and pre-refunded municipal bonds |  |  | 128,984 |  |  |  | 1 |  |  |  | (273 | ) |  |  | 128,712 |
US Treasury securities |  |  | 14,999 |  |  |  | — |  |  |  | (38 | ) |  |  | 14,961 |
Commercial paper |  |  | 10,884 |  |  |  | — |  |  |  | — |  |  |  | 10,884 |
|  |  | 239,929 |  |  |  | 2 |  |  |  | (511 | ) |  |  | 239,420 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 148,830 |  |  | $ | — |  |  | $ | (2,478 | ) |  | $ | 146,352 |
Municipal and pre-refunded municipal bonds |  |  | 60,533 |  |  |  | 1 |  |  |  | (912 | ) |  |  | 59,622 |
US Treasury securities |  |  | 5,222 |  |  |  | — |  |  |  | (46 | ) |  |  | 5,176 |
Mutual funds, held in rabbi trust |  |  | 12,419 |  |  |  | — |  |  |  | (606 | ) |  |  | 11,813 |
Federal government agencies |  |  | 350 |  |  |  | — |  |  |  | (5 | ) |  |  | 345 |
Certificates of deposit |  |  | 249 |  |  |  | — |  |  |  | — |  |  |  | 249 |
|  |  | 227,603 |  |  |  | 1 |  |  |  | (4,047 | ) |  |  | 223,557 |
|  | $ | 467,532 |  |  | $ | 3 |  |  | $ | (4,558 | ) |  | $ | 462,977 |
As of January 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 38,695 |  |  | $ | 1 |  |  | $ | (48 | ) |  | $ | 38,648 |
Municipal and pre-refunded municipal bonds |  |  | 127,097 |  |  |  | 11 |  |  |  | (53 | ) |  |  | 127,055 |
Commercial paper |  |  | 8,992 |  |  |  | — |  |  |  | — |  |  |  | 8,992 |
|  |  | 174,784 |  |  |  | 12 |  |  |  | (101 | ) |  |  | 174,695 |
Long-term Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 59,890 |  |  | $ | 3 |  |  | $ | (129 | ) |  | $ | 59,764 |
Municipal and pre-refunded municipal bonds |  |  | 53,134 |  |  |  | 17 |  |  |  | (46 | ) |  |  | 53,105 |
Mutual funds, held in rabbi trust |  |  | 10,827 |  |  |  | 20 |  |  |  | (54 | ) |  |  | 10,793 |
|  |  | 123,851 |  |  |  | 40 |  |  |  | (229 | ) |  |  | 123,662 |
|  | $ | 298,635 |  |  | $ | 52 |  |  | $ | (330 | ) |  | $ | 298,357 |
Gross Unrealized Losses and Fair Value of Marketable Securities | The following tables show the gross unrealized losses and fair value of the Company’s marketable securities with unrealized losses that are not deemed to have credit losses, aggregated by the length of time that individual securities have been in a continuous unrealized loss position, at January 31, 2022 and 2021, respectively.
| January 31, 2022 |
| Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |
Description of Securities | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
Corporate bonds | $ | 212,861 |  |  | $ | (2,661 | ) |  | $ | 14,110 |  |  | $ | (17 | ) |  | $ | 226,971 |  |  | $ | (2,678 | )
Municipal and pre-refunded municipal bonds |  | 162,081 |  |  |  | (1,162 | ) |  |  | 7,118 |  |  |  | (23 | ) |  |  | 169,199 |  |  |  | (1,185 | )
US Treasury securities |  | 20,137 |  |  |  | (84 | ) |  |  | — |  |  |  | — |  |  |  | 20,137 |  |  |  | (84 | )
Mutual funds, held in rabbi trust |  | 11,813 |  |  |  | (606 | ) |  |  | — |  |  |  | — |  |  |  | 11,813 |  |  |  | (606 | )
Federal government agencies |  | 345 |  |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | 345 |  |  |  | (5 | )
Total | $ | 407,237 |  |  | $ | (4,518 | ) |  | $ | 21,228 |  |  | $ | (40 | ) |  | $ | 428,465 |  |  | $ | (4,558 | )
| January 31, 2021 |
| Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |
Description of Securities | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
Corporate bonds | $ | 91,432 |  |  | $ | (177 | ) |  | $ | — |  |  | $ | — |  |  | $ | 91,432 |  |  | $ | (177 | )
Municipal and pre-refunded municipal bonds |  | 90,308 |  |  |  | (99 | ) |  |  | — |  |  |  | — |  |  |  | 90,308 |  |  |  | (99 | )
Mutual funds, held in rabbi trust |  | 10,793 |  |  |  | (54 | ) |  |  | — |  |  |  | — |  |  |  | 10,793 |  |  |  | (54 | )
Total | $ | 192,533 |  |  | $ | (330 | ) |  | $ | — |  |  | $ | — |  |  | $ | 192,533 |  |  | $ | (330 | )

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 + Details
Name: | us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration