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Investments - Equity Method Investments (Details) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Jul. 01, 2018	Jun. 25, 2017	Dec. 25, 2016	Jul. 01, 2018	Jun. 25, 2017	Dec. 31, 2017	Dec. 25, 2016
Schedule of Equity Method Investments [Line Items]
Investments in joint ventures	$ 1,700,000			$ 1,700,000
Loss from joint ventures	$ 8,000	$ 266,000		$ (7,000)	$ 93,000
Madison Paper Industries
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%			40.00%
Noncontrolling interest, ownership percentage by parent	10.00%			10.00%
Loss from joint ventures						$ (20,800,000)	$ 41,400,000
Proportionate share of gain after tax and net of noncontrolling interest							20,100,000
Investment in Madison			$ 0				$ 0
Gain on sale of non-hydro power assets			$ 3,900,000
Distributions received	$ 0	$ 0		$ 0	$ 0
Madison Paper Industries Owned Consolidated Subsidiary
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	80.00%			80.00%
Noncontrolling interest, ownership percentage by parent	20.00%			20.00%
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%