Proton Solutions Loans and Investments - MPTC Loan (Details) - USD ($)	1 Months Ended
	Aug. 31, 2018	Jan. 01, 2022	Oct. 02, 2020	Sep. 27, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Available-for- sale securities			$ 44,900,000	$ 58,800,000
MPTC loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cash received from outstanding deferred payment arrangement	$ 6,000,000.0
Accounts receivable			$ 600,000	$ 0
Available-for-sale Securities | MPTC Series B-2 Bonds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Available-for- sale securities	22,900,000
Stated rate (as a percent)			8.50%
Available-for-sale Securities | MPTC Series B-1 Bonds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Available-for- sale securities	$ 25,000,000.0
Stated rate (as a percent)			7.50%
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		$ 32,000,000.0