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Proton Solutions Loans and Investments - CPTC Loans (Details)
12 Months Ended
Dec. 06, 2017
USD ($)
tranche
Sep. 28, 2018
USD ($)
board_seat
Sep. 29, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 29, 2017
USD ($)
Mar. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Impairment charges     $ 51,400,000 $ 0    
Loss on equity investments   $ (7,300,000) 100,000 $ (1,600,000)    
Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Impairment charges     51,400,000      
Financing liabilities assumed by lenders $ 112,000,000          
Accounts receivable   $ 1,800,000 0      
Original CPTC loans | Varian Medical Systems, Inc.            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
DIP Facility, amount of additional financing           $ 7,300,000
Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Equity ownership (percent) 47.08% 47.08%        
Equity, fair value $ 20,100,000          
Equity investment in CPTC 9,500,000 $ 2,200,000 0      
Number of Board seats held by the Company | board_seat   1        
Number of Board seats | board_seat   5        
Loans Receivable | Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Modified former loans receivable $ 112,000,000          
Term Loan | Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Modified former loans receivable         $ 53,500,000  
Credit facility term (in years) 3 years          
Term Loan | Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Modified former loans receivable   $ 44,000,000 0      
Outstanding term loan   $ 53,500,000        
Term Loan | Varian Medical Systems, Inc. | Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Modified former loans receivable $ 53,500,000          
Number of tranches | tranche 4          
Paid-in-kind interest receivable (percent)   7.50%        
Term Loan | Varian Medical Systems, Inc. | Tranche A loan | Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Modified former loans receivable $ 2,000,000          
Default interest rate (percent)   9.50%        
Term Loan | Varian Medical Systems, Inc. | Tranche B loan | Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Modified former loans receivable 7,200,000          
Paid-in-kind interest receivable (percent)   10.00%        
Default interest rate (percent)   12.00%        
Term Loan | Varian Medical Systems, Inc. | Tranche C Loans | Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Modified former loans receivable 15,600,000          
Default interest rate (percent)   9.50%        
Term Loan | Varian Medical Systems, Inc. | Tranche D Loans | Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Modified former loans receivable $ 28,700,000          
Default interest rate (percent)   9.50%        
Revolving Loan | Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Short-term revolving loan   $ 3,700,000 $ 0      
Revolving Loan | Loans Receivable | Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Credit facility term (in years)   1 year        
Maximum lending commitment   $ 15,000,000        
Revolving Loan | Loans Receivable | Varian Medical Systems, Inc. | Original CPTC loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Maximum lending commitment   7,200,000        
Selling, general and administrative expenses | Original CPTC loans | Varian Medical Systems, Inc.            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loss on equity investments   $ (7,300,000)