Commitments and Contingencies - Summary of Company's Purchases from Manufacturing Cooperatives (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 257,039	$ 230,001	$ 207,768
SAC [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	148,511	149,878	144,511
Southeastern [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 108,528	$ 80,123	$ 63,257