SEGMENT INFORMATION (Net sales by geographical area) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Jan. 01, 2017
Disclosure of geographical areas [line items]
Net sales	$ 2,750,816	$ 2,585,070
United States
Disclosure of geographical areas [line items]
Net sales	2,382,800	2,253,910
Canada
Disclosure of geographical areas [line items]
Net sales	131,025	118,955
Europe and other
Disclosure of geographical areas [line items]
Net sales	$ 236,991	$ 212,205

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details