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Investments - Equity Method Investments (Details) - USD ($)	3 Months Ended				12 Months Ended
	Apr. 01, 2018	Mar. 26, 2017	Dec. 25, 2016	Mar. 27, 2016	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Investments in joint ventures	$ 1,751,000				$ 1,736,000
Loss from joint ventures	$ (15,000)	$ (173,000)
Madison Paper Industries
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%
Distributions received	$ 0	$ 0
Noncontrolling interest, ownership percentage by parent	10.00%
Loss from joint ventures				$ 41,400,000	$ (20,800,000)
Proportionate share of gain after tax and net of noncontrolling interest				$ 20,100,000
Investment in Madison			$ 0
Gain on sale of non-hydro power assets			$ 3,900,000
Madison Paper Industries Owned Consolidated Subsidiary
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	80.00%
Noncontrolling interest, ownership percentage by parent	20.00%
Ownership of Madison Paper Industries by Consolidated Subsidiary
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%
UPM-Kymmene \| Madison Paper Industries
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	60.00%