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Proton Solutions Loans and Investments - Additional Information (Details)
€ in Millions, $ in Millions
1 Months Ended 12 Months Ended 13 Months Ended
Sep. 28, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Jul. 31, 2017
EUR (€)
Sep. 28, 2018
USD ($)
Sep. 29, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jul. 31, 2018
USD ($)
Jan. 01, 2023
USD ($)
Apr. 30, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Purchase of outstanding senior secured debt         $ 0.0 $ 24.5 $ 0.0      
Fair Value $ 62.5       62.5 60.1        
Investment in available-for-sale securities         17.8 13.4 3.3      
Sale of available-for-sale securities         15.9 0.0 $ 8.6      
Proton Center, Munich | Loans Receivable                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Purchase of outstanding senior secured debt     $ 24.5 € 21.5            
RPTC securities                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Claims filed against all of RPTC's assets | €       € 89.0            
Accounts receivable 4.5       4.5 4.5        
RPTC securities | Loans Receivable                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Short-term 24.9       24.9 25.4        
Georgia Proton Therapy Center                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Accounts receivable 12.5       12.5 $ 0.0        
Unbilled accounts receivable $ 11.7       $ 11.7          
APTC Securities                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Stated rate (as a percent) 8.50%       8.50%          
Investment in available-for-sale securities   $ 6.0                
DRTC Loans                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Fair Value                   $ 8.0
DRTC Loans | Proton International | Senior Subordinated Notes                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Short-term                   $ 8.5
Available-for-sale Securities | Georgia Proton Therapy Center                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Stated rate (as a percent)       8.00%            
Investment in available-for-sale securities               $ 16.1    
Available-for-sale securities, including interest $ 8.5       $ 8.5          
Sale of available-for-sale securities $ 8.3                  
Forecast | Georgia Proton Therapy Center                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Fair Value                 $ 23.3