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Investments | 12 Months Ended
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Sep. 30, 2022
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |
Investments | INVESTMENTS The Company’s investments consisted of the following:
| As of September 30, 2022
| (In thousands)
| Adjusted Basis |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Short-term investments (due within one year) |  |  |  |  |  |  |
Held to maturity debt securities | $ | 218,391 |  |  | $ | — |  |  | $ | (3,661) |  |  | $ | 214,730 |
Held to maturity certifiate of deposit | 50,000 |  |  | — |  |  | — |  |  | 50,000 |
Total short-term investments | $ | 268,391 |  |  | $ | — |  |  | $ | (3,661) |  |  | $ | 264,730 |
Long-term investments (Due within one through three years) |  |  |  |  |  |  |
Held to maturity debt securities | 105,872 |  |  | — |  |  | (5,569) |  |  | 100,303 |
Total long-term investments | $ | 105,872 |  |  | $ | — |  |  | $ | (5,569) |  |  | $ | 100,303 |
Marketable debt securities | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
| As of September 30, 2021
| (In thousands)
| Adjusted Basis |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Short-term investments (due within one year) |  |  |  |  |  |  |
Held to maturity debt securities | $ | 56,627 |  |  | $ | 803 |  |  | $ | — |  |  | $ | 57,430 |
Total short-term investments | $ | 56,627 |  |  | $ | 803 |  |  | $ | — |  |  | $ | 57,430 |
Long-term investments (Due within one through three years) |  |  |  |  |  |  |
Held to maturity debt securities | $ | 195,595 |  |  | $ | 1,151 |  |  | $ | (103) |  |  | $ | 196,643 |
Held to maturity certificate of deposit | 50,000 |  |  | — |  |  | — |  |  | 50,000 |
Total long-term investments | $ | 245,595 |  |  | $ | 1,151 |  |  | $ | (103) |  |  | $ | 246,643 |
Marketable debt securities | $ | 127,481 |  |  | $ | — |  |  | $ | (753) |  |  | $ | 126,728 |

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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 https://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 https://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 https://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 https://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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