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Investments | 12 Months Ended
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Sep. 30, 2021
Held To Maturity Securities Classified [Abstract] |
Investments | NOTE 4. INVESTMENTS Investments at September 30, 2021 primarily consisted of corporate bonds that have maturities of less than 36 months, a certificate of deposit and marketable equity securities. The Company’s investments in corporate bonds consist of both short-term and long-term bonds and are classified as “held-to-maturity” on the Company’s Consolidated Balance Sheets. The Company’s certificate of deposit matures in less than 24 months and is classified as “held-to-maturity” on the Company’s Consolidated Balance Sheet. The Company’s marketable equity securities consist of mutual funds that primarily invest in U.S. government bonds, U.S. government agency bonds, corporate bonds and other asset-backed debt securities. Dividends from these funds are automatically reinvested. The Company may also invest excess cash balances in money market accounts, government-sponsored enterprise securities, and/or commercial paper. The Company accounts for its held to maturity investments in accordance with FASB ASC 320, Investments – Debt and Equity Securities and its marketable equity securities in accordance with ASC 321, Investments – Equity Securities. The following tables summarize the Company’s short-term, long-term investments and marketable securities as of September 30, 2021 and September 30, 2020 by measurement category.
Held to Maturity |  | As of September 30, 2021 |  |  |  |  |
|  | (in thousands) |  |  |  |  |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  |  |  |
Commercial notes (due within one year) |  | $ | 56,627 |  |  | $ | 803 |  |  | $ | - |  |  | $ | 57,430 |  |  |  |  |
Commercial notes (due within one through three years) |  | $ | 195,595 |  |  | $ | 1,151 |  |  | $ | (103 | ) |  | $ | 196,643 |  |  |  |  |
Certificate of deposit (due within two years) |  | $ | 50,000 |  |  | $ | - |  |  | $ | - |  |  | $ | 50,000 |  |  |  |  |
Total |  | $ | 302,222 |  |  | $ | 1,954 |  |  | $ | (103 | ) |  | $ | 304,073 |  |  |  |  |
|  | As of September 30, 2020 |  |  |  |  |
|  | (in thousands) |  |  |  |  |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  |  |  |
Commercial notes (due within one year) |  | $ | 86,890 |  |  | $ | 1,590 |  |  | $ | - |  |  | $ | 88,480 |  |  |  |  |
Commercial notes (due within one through three years) |  | $ | 137,487 |  |  | $ | 4,574 |  |  | $ | (79 | ) |  | $ | 141,982 |  |  |  |  |
Total |  | $ | 224,377 |  |  | $ | 6,164 |  |  | $ | (79 | ) |  | $ | 230,462 |  |  |  |  |
Fair Value |  | As of September 30, 2021 |  |  |  |  |
|  | (in thousands) |
|  | Cost |  |  | Realized Gains/(Losses) |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Marketable securities |  | $ | 125,000 |  |  | $ | 2,481 |  |  | $ | 135 |  |  | $ | (888 | ) |  | $ | 126,728 |
Total |  | $ | 125,000 |  |  | $ | 2,481 |  |  | $ | 135 |  |  | $ | (888 | ) |  | $ | 126,728 |
Fair Value |  | As of September 30, 2020 |  |  |  |  |
|  | (in thousands) |
|  | Cost |  |  | Realized Gains/(Losses) |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Marketable securities |  | $ | 85,000 |  |  | $ | 95 |  |  | $ | - |  |  | $ | (75 | ) |  | $ | 85,020 |
Total |  | $ | 85,000 |  |  | $ | 95 |  |  | $ | - |  |  | $ | (75 | ) |  | $ | 85,020 |

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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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