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Marketable Securities (Tables) | 3 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | The Company's portfolio of available-for-sale marketable securities consists of the following (in millions):
| Current |  | Noncurrent
Available-for-sale: | December 31, 2021 |  | October 1, 2021 |  | December 31, 2021 |  | October 1, 2021
U.S. Treasury and government | $ | 7.8 |  |  | $ | 7.6 |  |  | $ | 3.4 |  |  | $ | 6.0 |
Corporate bonds and notes | 121.5 |  |  | 117.0 |  |  | — |  |  | — |
Municipal bonds | 7.7 |  |  | 12.6 |  |  | 0.1 |  |  | 1.1 |
Total | $ | 137.0 |  |  | $ | 137.2 |  |  | $ | 3.5 |  |  | $ | 7.1 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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