NATURE OF OPERATIONS AND ACCOUNTING POLICIES. - FYE (Details) - item	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
NATURE OF OPERATIONS AND ACCOUNTING POLICIES.
Number of manufacturing, distribution and component manufacturing locations in which the Company operated	7
Fiscal Year End
Length of fiscal years	371 days	364 days	364 days