Discontinued Operations Net Income (Loss) from Bakery Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended	12 Months Ended
	Jul. 02, 2017	Jan. 01, 2017	Oct. 02, 2016	Apr. 03, 2016	Sep. 27, 2015	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016	Dec. 29, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Income (loss) from discontinued operations, net of income taxes						$ 0	$ 0	$ 10,494
Gain on disposal of discontinued operations before income taxes						0	0	25,529
Gain on disposal of discontinued operations, net of income taxes						0	0	10,669
Net income (loss) from discontinued operations						0	0	21,163
Proceeds from sales						81,516	262,173	204,388
Gain on sales of other assets, net	$ (41,050)	$ 23,825	$ 37,756	$ 8,426		(39,076)	71,931	74,009
Bakery | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Revenues								25,885
Cost of sales								(7,543)
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)								18,342
General and administrative								(1,093)
Depreciation and amortization								(2,297)
Other expense, net								(19)
Income (loss) from discontinued operations before income taxes								14,933
(Provision for) benefit from income taxes								(4,439)
Income (loss) from discontinued operations, net of income taxes								10,494
Gain on disposal of discontinued operations before income taxes								25,529
Provision for income taxes on gain on disposal								(14,860)
Gain on disposal of discontinued operations, net of income taxes								10,669
Net income (loss) from discontinued operations								21,163
Severance Related Costs Associated with Discontinued Operation								791
Withdrawal from Multiemployer Defined Benefit Plan | Bakery | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Loss Contingency Accrual, Period Increase (Decrease)					$ (12,486)				$ 13,500
Sale of Other Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sales						10,534	10,727	10,478
Gain on sales of other assets, net						$ 2,018	$ 6,204	1,672
Sale of Other Assets | Bakery | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sales								50
Gain on sales of other assets, net								$ 32