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Short-Term and Long-Term Investments | 3 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Short-Term and Long-Term Investments | 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 |
Interest income from investments was $0.3 million and $1.1 million for the three months ended December 31, 2021 and 2020, respectively. Interest income is included in other income (expense), net on the Company's consolidated income statements. 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) |
The Company invests in securities that are rated investment grade. The Company reviews the individual securities in its portfolio to determine whether a credit loss exists by comparing the extent to which the fair value is less than the amortized cost and considering any changes to ratings of a security by a ratings agency. The Company determined that as of December 31, 2021, there were no credit losses on any investments within its portfolio.

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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 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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