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Marketable Securities (Notes) | 12 Months Ended
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Oct. 02, 2020
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure | 3. MARKETABLE SECURITIES The Company's portfolio of available-for-sale marketable securities consists of the following (in millions):
| Current |  | Noncurrent
Available-for-sale: | October 2, 2020 |  | September 27, 2019 |  | October 2, 2020 |  | September 27, 2019
U.S. Treasury and government | $ | 129.4 |  |  | $ | 34.2 |  |  | $ | 5.0 |  |  | $ | 20.0 |
Corporate bonds and notes | 276.8 |  |  | 66.2 |  |  | — |  |  | 5.9 |
Municipal bonds | 1.9 |  |  | 102.9 |  |  | 0.2 |  |  | 1.7 |
Total | $ | 408.1 |  |  | $ | 203.3 |  |  | $ | 5.2 |  |  | $ | 27.6 |
The contractual maturities of noncurrent available-for-sale marketable securities were due within two years or less. There were gross unrealized gains of $0.3 million on U.S. Treasury securities and $0.2 million on corporate bonds and notes as of October 2, 2020, and $0.1 million in gross unrealized losses on municipal bonds as of September 27, 2019.

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