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PROTON SOLUTIONS LOANS AND INVESTMENTS - Loans and Commitments (Details) - USD ($)
$ in Millions
Jan. 01, 2021
Oct. 02, 2020
Dec. 06, 2017
Long-term notes receivable and Available-for-sale Securities [Line Items]      
Available-for-sale securities $ 45.8 $ 44.9  
Loans Receivable      
Long-term notes receivable and Available-for-sale Securities [Line Items]      
Notes receivable and secured debt 63.9 61.9  
NYPC loan | Loans Receivable      
Long-term notes receivable and Available-for-sale Securities [Line Items]      
Long-term 35.7 34.9  
RPTC senior secured debt | Loans Receivable      
Long-term notes receivable and Available-for-sale Securities [Line Items]      
Short-term notes receivable 26.4 25.2  
Proton International LLC loan | Loans Receivable      
Long-term notes receivable and Available-for-sale Securities [Line Items]      
Long-term 1.8 1.8  
MPTC Series B-1 Bonds      
Long-term notes receivable and Available-for-sale Securities [Line Items]      
Available-for-sale securities 19.2 18.9  
MPTC Series B-2 Bonds      
Long-term notes receivable and Available-for-sale Securities [Line Items]      
Available-for-sale securities 21.1 20.6  
APTC securities      
Long-term notes receivable and Available-for-sale Securities [Line Items]      
Available-for-sale securities 5.5 5.4  
C P T C      
Long-term notes receivable and Available-for-sale Securities [Line Items]      
CPTC Loans $ 11.8 $ 11.8  
C P T C | Loans Receivable      
Long-term notes receivable and Available-for-sale Securities [Line Items]      
Term loan     $ 112.0