Commitments and Contingencies - Summary of Company's Purchases from Manufacturing Cooperatives (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 280,935	$ 257,039	$ 230,001
SAC [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	155,583	148,511	149,878
Southeastern [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 125,352	$ 108,528	$ 80,123