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Proton Solutions Loans and Investments - CPTC Loans (Details)
12 Months Ended
Dec. 06, 2017
USD ($)
tranche
Sep. 27, 2019
USD ($)
Sep. 28, 2018
USD ($)
Sep. 29, 2017
USD ($)
Mar. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impairment charges   $ 0 $ 0 $ 51,400,000  
Modified former loans receivable   $ 44,000,000.0 44,000,000.0    
Original CPTC loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impairment charges       $ 51,400,000  
Financing liabilities assumed by lenders $ 112,000,000.0        
Equity ownership (percent) 47.08% 47.08%      
Equity, fair value $ 20,100,000        
Equity investment in CPTC 9,500,000 $ 0 2,200,000    
Accounts receivable   2,600,000 1,800,000    
Original CPTC loans | Varian Medical Systems, Inc.          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
DIP Facility, amount of additional financing         $ 7,300,000
Loans Receivable | Original CPTC loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Modified former loans receivable $ 112,000,000.0        
Term Loan | Original CPTC loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Modified former loans receivable   $ 44,000,000.0 44,000,000.0    
Credit facility term (in years) 3 years        
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 $ 2,000,000.0        
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   $ 5,300,000 $ 3,700,000    
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   $ 15,000,000.0      
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