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Proton Solutions Loans and Investments - MPTC Loan (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2018
Jun. 29, 2018
Mar. 30, 2018
Sep. 29, 2017
Dec. 30, 2016
Sep. 28, 2018
Sep. 29, 2017
Sep. 30, 2016
Jan. 01, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Impairment charges   $ 11,000,000 $ 11,100,000 $ 13,100,000 $ 38,300,000 $ 22,400,000 $ 51,400,000 $ 2,200,000  
Available-for- sale securities       60,100,000   62,500,000 60,100,000    
MPTC loan                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Cash received from outstanding deferred payment arrangement $ 6,000,000                
Accounts receivable       0   4,100,000 0    
MPTC loan | Loans Receivable                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Commitment       $ 35,000,000.0     $ 35,000,000.0    
Impairment charges           22,100,000      
Reclassification From Long-Term Accounts Receivable In June 2016 | MPTC loan | Loans Receivable                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Financing receivable deferral           25,000,000      
LT Notes           $ 25,000,000      
Available-for-sale Securities | MPTC Series B-2 Bonds                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Stated rate (as a percent)           8.50%      
Available-for- sale securities 22,900,000                
Available-for-sale Securities | MPTC Series B-1 Bonds                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Stated rate (as a percent)           7.50%      
Available-for- sale securities $ 25,000,000                
Forecast | Available-for-sale Securities | MPTC Series B-2 Bonds                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Available-for- sale securities                 $ 33,900,000
Forecast | Available-for-sale Securities | MPTC Series B-1 Bonds                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Available-for- sale securities                 $ 32,000,000