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Marketable Securities
 6 Months Ended
Apr. 02, 2021
Investments, Debt and Equity Securities [Abstract]  
MARKETABLE SECURITIES MARKETABLE SECURITIES
The Company's portfolio of available-for-sale marketable securities consists of the following (in millions):
    
CurrentNoncurrent
Available for sale:April 2,
2021		October 2,
2020		April 2,
2021		October 2,
2020
U.S. Treasury and government $105.0 $129.4 $— $5.0 
Corporate bonds and notes251.8 276.8 2.2 — 
Municipal bonds2.9 1.9 1.8 0.2 
Total$359.7 $408.1 $4.0 $5.2 
The contractual maturities of noncurrent available-for-sale marketable securities were due within two years or less. There were gross unrealized gains of $0.1 million on U.S. Treasury securities and $0.1 million on corporate bonds and notes as of April 2, 2021, and 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.