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Short-Term and Long-Term Investments (Tables) | 3 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Short-Term and Long-Term Investments | Short-term investments consist of the following (in thousands):
December 31, 2021 |  | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Certificates of deposits |  | $ | 992 |  |  | $ | — |  |  | $ | — |  |  | $ | 992 |
Corporate bonds and notes |  | 177,248 |  |  | 10 |  |  | (165) |  |  | 177,093 |
Municipal bonds and notes |  | 15,377 |  |  | — |  |  | (18) |  |  | 15,359 |
U.S. government securities |  | 136,091 |  |  | — |  |  | (157) |  |  | 135,934 |
U.S. government agency securities |  | 17,193 |  |  | — |  |  | (23) |  |  | 17,170 |
|  | $ | 346,901 |  |  | $ | 10 |  |  | $ | (363) |  |  | $ | 346,548 |
September 30, 2021 |  | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Certificates of deposits |  | $ | 255 |  |  | $ | — |  |  | $ | — |  |  | $ | 255 |
Corporate bonds and notes |  | 186,043 |  |  | 116 |  |  | (52) |  |  | 186,107 |
Municipal bonds and notes |  | 13,570 |  |  | 1 |  |  | (5) |  |  | 13,566 |
U.S. government securities |  | 102,607 |  |  | 12 |  |  | (4) |  |  | 102,615 |
U.S. government agency securities |  | 27,096 |  |  | — |  |  | (9) |  |  | 27,087 |
|  | $ | 329,571 |  |  | $ | 129 |  |  | $ | (70) |  |  | $ | 329,630 |
Long-term investments consist of the following (in thousands):
December 31, 2021 |  | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate bonds and notes |  | $ | 48,845 |  |  | $ | — |  |  | $ | (207) |  |  | $ | 48,638 |
Municipal bonds and notes |  | 2,262 |  |  | — |  |  | (23) |  |  | 2,239 |
U.S. government securities |  | 24,426 |  |  | — |  |  | (85) |  |  | 24,341 |
U.S. government agency securities |  | 1,783 |  |  | — |  |  | (10) |  |  | 1,773 |
|  | $ | 77,316 |  |  | $ | — |  |  | $ | (325) |  |  | $ | 76,991 |
September 30, 2021 |  | Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate bonds and notes |  | $ | 53,128 |  |  | $ | 13 |  |  | $ | (34) |  |  | $ | 53,107 |
Municipal bonds and notes |  | 11,114 |  |  | 1 |  |  | (4) |  |  | 11,111 |
U.S. government securities |  | 59,614 |  |  | 2 |  |  | (8) |  |  | 59,608 |
U.S. government agency securities |  | 8,957 |  |  | — |  |  | (5) |  |  | 8,952 |
|  | $ | 132,813 |  |  | $ | 16 |  |  | $ | (51) |  |  | $ | 132,778 |
Schedule of Investments That Have Been in a Continuous Unrealized Loss Position | The following table summarizes investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for more than 12 months as of December 31, 2021 (in thousands):
|  | Less Than 12 Months |  | 12 Months or Greater |  | Total
December 31, 2021 |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Corporate bonds and notes |  | $ | 196,228 |  |  | $ | (372) |  |  | $ | — |  |  | $ | — |  |  | $ | 196,228 |  |  | $ | (372) |
Municipal bonds and notes |  | 16,144 |  |  | (41) |  |  | — |  |  | — |  |  | 16,144 |  |  | (41) |
U.S. government securities |  | 160,275 |  |  | (242) |  |  | — |  |  | — |  |  | 160,275 |  |  | (242) |
U.S. government agency securities |  | 18,943 |  |  | (33) |  |  | — |  |  | — |  |  | 18,943 |  |  | (33) |
Total |  | $ | 391,590 |  |  | $ | (688) |  |  | $ | — |  |  | $ | — |  |  | $ | 391,590 |  |  | $ | (688) |
The following table summarizes investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for more than 12 months as of September 30, 2021 (in thousands):
|  | Less Than 12 Months |  | 12 Months or Greater |  | Total
September 30, 2021 |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Corporate bonds and notes |  | $ | 151,986 |  |  | $ | (86) |  |  | $ | — |  |  | $ | — |  |  | $ | 151,986 |  |  | $ | (86) |
Municipal bonds and notes |  | 13,764 |  |  | (9) |  |  | — |  |  | — |  |  | 13,764 |  |  | (9) |
U.S. government securities |  | 77,401 |  |  | (12) |  |  | — |  |  | — |  |  | 77,401 |  |  | (12) |
U.S. government agency securities |  | 31,384 |  |  | (14) |  |  | — |  |  | — |  |  | 31,384 |  |  | (14) |
Total |  | $ | 274,535 |  |  | $ | (121) |  |  | $ | — |  |  | $ | — |  |  | $ | 274,535 |  |  | $ | (121) |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- 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
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