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Marketable Securities | 9 Months Ended
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Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | 3. MARKETABLE SECURITIES The Company’s portfolio of available-for-sale marketable securities consists of the following (in millions):
| Current |  | Noncurrent
| June 30, 2023 |  | September 30, 2022 |  | June 30, 2023 |  | September 30, 2022
U.S. Treasury and government securities | $ | 14.3 |  |  | $ | 13.1 |  |  | $ | 3.0 |  |  | $ | 0.5 |
Corporate bonds and notes | — |  |  | 0.2 |  |  | — |  |  | — |
Municipal bonds | 0.6 |  |  | 7.0 |  |  | — |  |  | — |
Total marketable securities | $ | 14.9 |  |  | $ | 20.3 |  |  | $ | 3.0 |  |  | $ | 0.5 |
Neither gross unrealized gains and losses nor realized gains and losses were material as of June 30, 2023, or September 30, 2022.

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