Discontinued Operations Gain on Disposal of the Bakery (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 27, 2015	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016	May 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of the Bakery		$ 0	$ 0	$ 78,408
Goodwill allocated to the sale of the Bakery		(65,961)	(30,132)
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
Bakery | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Proceeds from sale of the Bakery				78,408
Net working capital				5,655
Net properties sold				30,664
Goodwill allocated to the sale of the Bakery				(12,067)
Other				2,684
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Post Closing Adjustments, before Income Tax				27,338
Post-closing adjustments on the sale of the Bakery				(1,809)
Gain on disposal of discontinued operations before income taxes				25,529
Provision for income taxes				(14,860)
Gain on disposal of discontinued operations, net of income taxes				$ 10,669
Disposal Group, Including Discontinued Operation, Consideration					$ 78,500
Obligation for Employer Provided Health Insurance [Member] | Bakery | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Other	$ (1,993)