The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Investments - Equity Method Investments (Details) - USD ($)	3 Months Ended				12 Months Ended
	Dec. 27, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Schedule of Equity Method Investments [Line Items]
Investments in joint ventures	$ 0				$ 0	$ 0
Gain from joint ventures	5,000,000	$ 0	$ 0	$ 0	5,000,000	0	$ 10,764,000
Non-marketable equity securities	$ 20,900,000				20,900,000	13,400,000
Interest income and other expense, net					24,057,000	21,580,000	14,510,000
Realized gain on partial sale of investments					2,500,000
Unrealized gain due to mark to market of remaining investment					7,600,000	$ 0	0
Non-marketable Equity Securities
Schedule of Equity Method Investments [Line Items]
Interest income and other expense, net					$ 10,100,000
Madison Paper Industries
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%				40.00%
Gain from joint ventures							$ 10,800,000
Madison Paper Industries Owned Consolidated Subsidiary
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	80.00%				80.00%
Ownership of Madison Paper Industries by Consolidated Subsidiary
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%				50.00%
UPM-Kymmene \| Madison Paper Industries
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	60.00%				60.00%
Madison Paper Industries \| Madison Paper Industries
Schedule of Equity Method Investments [Line Items]
Equity method investment, noncontrolling interest, ownership percentage	10.00%				10.00%
Madison Paper Industries \| Madison Paper Industries Owned Consolidated Subsidiary
Schedule of Equity Method Investments [Line Items]
Equity method investment, noncontrolling interest, ownership percentage	20.00%				20.00%